Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Dermatology Topic Images
? Well defined, deeply
erythematous plaques,
usually symmetrical on
extensors
? Silvery (because of air
trapped between
scales), micaceous
scale
Psoriasis
? Grattage test (Auspitz
sign)
? Koebner's
phenomenon
? Wornoff's ring
Guttate psoriasis
? Small raindrop like <1 cm
sized plaques,
symmetrically distributed
on trunk
? Comes in crops
? Associated with
Streptococcal sore throats
? Mainly in children
? Antibiotic (erythromycin)
treatment is indicated
Pustular psoriasis
? Generalized (von Zumbusch):
? Acute, widespread, severe, life-
threatening, emergency
? characterized by lakes of pus
? precipitated by WITHDRAWL of
SYST SEROID and others
? Rx:
? DOC: pustular psoriasis is oral
retinoid = acitretin
? Methotrexate
? PUVA
Nail psoriasis: (10-50%)
? Pitting (random, irregular, deep
and large)=Thimble pitting
Other causes of nail pitting;
? Alopecia areata (patterned pits),
Nail biting and trauma, eczema
? Onycholysis and oil-drop sign
? Subungual hyperkeratosis
Arthropathic psoriasis: 5-10%
? HLA B-27
? Asymmetrical oligoarthritis:
MC. One or few joints of the
hand and feet leading to
sausage digits.
? Distal IP joint disease: most
characteristic but not most
common.
? Arthritis Mutilans:
destructive arthritis of fingers
and toes with "opera glass
deformity" or "pencil in
cup" deformity.
Psoriasis: Histology
? HK with PK
? Munro's microabcess
? Hypogranulosis
? Acanthosis and
papillomatosis with
rounding and elongation
of rete ridges
? Spongiform pustules of
Kogoj
? Suprapapillary thinning
? Upper dermal vessel
dilatation and tortusity
with mononuclear
infiltrate
Lichen Planus
? Idiopathic
inflammatory disease
of skin with
significant MUCOSAL
and NAIL
involvement
? CMI mediated
autoimmune disease
with possible
association with HCV
? KOEBENERIZATION
is characteristic
Lichen Planus
? 5 P's: pruritic, purple or
violaceous, polygonal,
plane topped, papules &
plaques
? White reticualte lines:
Wickham striae: Tyndall
effect due to focal
hypergranulosis
? Flexor aspect of wrist, lumbar
area, scalp, penis, oral
mucosae and shins
? Possible nail involvement
Lichen Planus
Mucosal LP:
? 50% of pt
? Net-like white,
non-removable,
reticular
pattern is
most
characteristic
? More chronic
Lichen Planus
Nail LP:
? 10-25% of pt
? Longitudinal
ridging and
grooving and
scarring leading to
dorsal pterygium
formation,
? Difficult to treat
Lichen Planus
Scalp LP: Lichen
planopilaris or
follicular LP
? follicular LP
papules with
atrophic scarring
alopecia.
? Difficult to treat
Lichen Planus
Histology
? Hyperkeratosis without
PK
? focal wedge shaped
hypergranulosis
? irregular acanthosis (saw
toothing)
? Civatte or colloid
bodies (Apoptotic),
? basal cell degeneration
(BCD),
? MAX-JOSEPH space
? band-like infiltrate of
lymphocytes at the DEJ.
MOST CH.
PITYRIASIS ROSEA:
? Etiology: ? (HHV7).
? C/F:
? herald patch is followed
in a few days to weeks
by eruption of multiple
smaller lesions
following skin lines in a
"fir tree" pattern with
typical peripheral
collarette scale
? Course: Spontaneous
resolution after 4-8
weeks.
? Differential Diagnosis:
Secondary syphilis is
an important differential
Pemphigus vulgaris ? Clinical appearance
Nikolsiky sign
Pemphigus vulgaris
? Tzanck smear:
characteristic
acantholytic cells.
? Skin biopsy: Fresh
blister (<48hr)
shows Suprabasal
cleavage,
acantholysis with
row of tombstone
appearance.
Pemphigus vulgaris
? Skin biopsy for Direct
Immunofluroscence
(DIF): Perilesional
skin shows the
presence of
intercellular IgG and
C3 deposition within
the epidermis in a
Fish Net Pattern.
HAILEY-HAILEY DISEASE: (FAMILIAL
BENIGN PEMPHIGUS)
? AD disease
? minute vesicles, erosions,
crusting, fissures and foul
smell in the intertriginous
areas
? caused by a defect in calcium
pump of cadherin junctions
(desmosomes) of epidermal
cells leading to acantholysis
(ATPase2C1).
? It can be confused with
intertrigo, candidiasis & tinea
cruris.
? (IMP: Histologically
appearance is likened to a
"dilapidated or crumbling
Brick-wall")
Bullous pemphigoid
? Prototype of subepidermal
blistering dis
? commoner than pemphigus
vulgaris & occurs in old age (i.e.
>60)
? autoantibody reacting with
basement membrane zone: major
& minor bullous pemphigoid
antigens (BP AG 1&2 with 230
&180 KD respectively)
? autoantibodies localize to the
epidermal side (ROOF) of
NaCl split skin
Bullous pemphigoid
? Tzanck smear:
No acantholytic
cells, many
eosinophils, few
neutrophils
? Histology:
subepidermal
blisters i.e. intact
epidermis forms
the roof, with
mixed dermal
infiltrates,
especially
eosinophils.
Bullous pemphigoid
? DIF: linear
deposition of C3 +/-
IgG at DEJ
? Salt split IF:
antibodies in the roof
of salt split
LINEAR IGA DISEASE
? Clinical Picture
LINEAR IGA DISEASE
? Histology:
the picture
resembles DH
or BP.
? DIF:
Characterized
by linear IgA
deposition in
basement
membrane
zone (BMZ).
DERMATITIS HERPETIFORMIS
? Intense itching
? Grouped paulovesicles
which are usually excoriated
and scabbed and needs to be
differentiated from Scabies
and acute atopic dermatitis.
? The sites of predilection are
elbows and knees,
buttocks, upper back and
face.
? Intact vesicles seldom seen
since they are ruptured by
self scratching. Lesions heal
with no scarring.
DERMATITIS HERPETIFORMIS
? Histology: Neutrophilic
Microabscess in dermal
papillary tip is
characteristic.
? DIF: It shows granular
IgA deposition in BMZ.
? Screening for the
presence of celiac
disease.
? Provocation test: iodides
in diet or patch.
EPIDERMOLYSIS BULLOSA ACQUISITA (EBA)
? An acquired
IMMUNOBULLOUS disease
mimicking BP
? Bullae tend to occur at sites
of trauma.
? The IgG in these patients
binds to the anchoring fibrils
(COL 7A1) attached to the
Lamina densa.
? EBA can be differentiated
from BP on a salt-split DIF
only (here in BASE of split)
EPIDERMOLYSIS BULLOSA CONGENITA
? Gentetically inherited
? No AUTOANTIBODIES
? MECHANOBULLOUS
Trauma prone sites
? 3 main types:
? EB simplex: K-5/14: split thru
basal layer without much
sequale
? EB junctionalis: Laminin 5,
6 4 integrins: split thru lamina
lucida with significant scarring
? EB dystrophicans: split thru
lamina densa/ sublamina densa
(defective Collagen 7)
severe scarring mainly in AR
form
Irritant CD
Commonest
irritants:
Water (MC), soaps,
solvents, alkalis,
acids, feces and
urine
Napkin
dermatitis,
detergents, solvents
and vegetables etc
Housewives'
eczema.
ACD
? Individual susceptibility
? Requires sensitization or
priming
? Latency
? Memory T cells are
involved
? delayed hypersensitivity
reaction (Type IV)
? Patch test
? MC: Nickel
ACD
? Airborne allergic
contact dermatitis
(ABCD):
? Airboene allergens
? Exposed sites
? May spread to all over body
? Parthenium
hysterophorus
(congress grass) is
commonest cause of
ABCD in India.
? Sesquiterpene lactone
ATOPIC DERMATITIS
Phases of AD:
? Infantile: Face &
flexures, trunk f/b
extensors when
crawling
? Children: Flexures
? Adults: Flexural
ATOPIC DERMATITIS
ATOPIC STIGMATA:
? The lateral thinning of
the eyebrows is
termed "Hertoghe's
sign".
? A deep fold (Dennie-
Morgan-fold) can be
found under the lower
lid
ATOPIC DERMATITIS
ATOPIC STIGMATA:
? Hyperlinear palms
? P. Alba:
? white area (alba) with
scaling (pityriasis.),
? common in children, atopics,
dry skin and malnutrition.
? Usually multiple ill-defined
patches on face, neck upper
trunk
? Keratosis pilaris:
Antenna sign
ATOPIC DERMATITIS
ATOPIC STIGMATA:
? Increased incidence of
infections: Eczema
herpeticum or
Kaposi's varicelliform
eruption: severe
widespread HSV infection
Seborrheic dermatitis
?
distinctive morphology: Red
lesions covered with
yellowish, greasy scales
?
distinctive distribution:
(scalp, face and upper trunk)
which are areas rich in
sebaceous glands.
?
infants: Scalp (Cradle
Cap)
?
Severe course with HIV and
Parkinsonism. Also
associated with
Cerebrovascular accidents.
?
Rx: topical antifungals,
selenium sulfide and steroids
ASTEATOTIC ECZEMA (XEROTIC ECZEMA,
ECZEMA CRAQUELE)
? elderly and people
with dry skin
? winter
? reduction of in skin
surface lipid
? Extensor
extremities dry,
slightly scaly and
criss-crossed on the
surface (crazy-
paving) to produce
a reticulate pattern
with minimal
inflammation
LICHEN SIMPLEX (CIRCUMSCRIBED
NEURODERMATITIS)
? circumscribed
area of
lichenification
? Chronic itching
and rubbing
? Idiopathic
? Easily acessed
sites: wrists,
elbows, ankles,
back of neck,
genetilia
Nummular dermatitis (Discoid Eczema)
? circular or oval
plaques of eczema
with a clearly
demarcated margin.
? coin-shaped, 1 to 5
cm in diameter itchy
plaques.
? There are
commonly
distributed on the
extremities
? Usually symmetrical
Popmpholyx or Dishydriotic eczema
? vesicular palmo-plantar
dermatitis
? deep-seated Tapioca or
sago-grain like vesicles on
palms and soles and sides of
fingers,
? Etiology: Idiopathic, allergic
contact reactions (nickel),
atopy,
? Dyshidriosis is NOT a must.
? Management:
? self resolving in 2-4 weeks
? topical corticosteroids, on
occasion short course of
systemic corticosteroids
CHANCRE
? Clinical
picture
CHANCROID
? Chancroid
? Giant Chancroid
Herpes genitalis
? Primary HG
Recurrent HG
LGV ? Sign of
Groove
Granuloma Inguinale (Donovanosis)
? Clinical picture
Syphilis
SECONDARY SYPHILIS:
? Systemic: fever,
malaise, anorexia
? Skin: (in 75%):. The
lesions are symmetrical,
polymorphic (never
Vesico-bullous);,
asymptomatic affecting
palms and soles.
? Buschke Olendroff
sign (BO sign)+:
rebound tenderness
Syphilis: S2
? Generalized
lymphadenopathy
? Mucosal
involvement ( in
1/3rd): over genitalia
and mouth:
? Mucous patches:
? Snail-track ulcer:
? Condylomata lata
Infectivity: Mucous patches> C lata > Chancre > S2 skin lesions
URETHRAL DISCHARGE: Gonorrhea
? Neisseria gonorrhoeae
(gonococcus) GNDC
? Incubation period: 1-10
days
? MALES:
? acute gonococcal urethritis
burning micturition, frequency,
purulent discharge per-urethra
? NOT ALWAYS frankly purulent
and patient may be
asymptomatic.
? complicated by Tysonitis,
periuretheral abscess, littritis,
cowperitis, prostatitis, seminal
vesiculitis and epididymitis.
URETHRAL DISCHARGE
DIAGNOSIS:
? Gram's staining. Presence of GNDC
inside the PMN's is diagnostic of
Gonorrhoea. (95% sensitive and specific
in males while sensitivity is less in
cervical, rectal, oropharyngeal cases
Do a culture.)
? Culture: on Thayer-Martin medium.
Transport on Stuart's medium]
? There is no useful serological test for
gonorrhoea.
TREATMENT:
? Cefixime or ceftriaxone
? V.V. IMP: Syndromic approach
advocates ADDING drug for Chlamydia
For all cases of uretheral discharge:
Cefixime 400 mg stat + Azithromycin 1 g
stat.
GENITAL WARTS: CONDYLOMA
ACUMINATA
? HPV: 6, 11 most commonly; Types
16, 18, 31, 33, and 35 are strongly
associated with genital dysplasia and
carcinoma.
? C/F: Multiple, soft, filiform papules,
discrete with some coalescing to
raspberry-like lesions, on the glans
penis and prepuce or perianally.
? Diagnosis:
? primarily clinical;
? Acetowhitening:
? Pap smear All women should have an
annual Pap smear.
TT
Skin lesions
? Number: 1-3
? Symmetry: Localized
? Size: Large
? Borders: Regular: Well-
defined raised border
and depressed center
(saucer right side up)
? Sensation: Total
anesthesia
? Hair: Total loss
? Surface: Dry and scaly
BT
Skin lesions
? Number: Single or few (3-10)
? Symmetry: Localized
? Size: Large
small
? Borders: Well-defined but with
areas of poor definition
(Serrated); Satellite
lesions near margins
? Sensation: Significant
hypesthesia
? Hair: Significant loss
? Surface: Significantly Dry +/-
scaly
Skin lesions
? Number: Several (10-30):
BB
? Symmetry: Asymmetrical
? Size: small> large
? Borders:
?
Both well defined and ill
defined lesions coexist
(polymorphic) in equal
number
?
Bizarre geographical
lesion
?
Annular lesions
?
Swiss cheese
or
punched out lesions are
characteristic
? Sensation: Mild-moderate
hypesthesia
? Hair: mild loss
? Surface: dry/ shiny
Skin lesions
LL
? Number: Numerous,
uncountable
? Symmetry: B/L
symmetrical
? Size: small
? Borders: Ill-defined
? Sensation:
Normoaesthetic
? Hair: normal
? Surface: shiny
LL: Other Imp Details
? oil-smeared appearance
? shiny and succulent
nodules.
? infiltration of the facial
skin especially over the
forehead, the zygoma, the
chin, and the earlobes
? lateral madarosis
? depressed nasal bridge
? leonine facies.
? Nasal symptoms
(stuffiness, crusts &
epistaxis)
earliest
symptoms.
LL: VARIANTS
? LUCIO LEPROSY (lepra bonita or beautiful leprosy):
? Shiny, thickened skin, loss of body hair, and widespread
sensory loss without distinct leprosy lesions on skin.
? variety of LL Hansen's disease.
? Usually in Mexico, central America
? HISTOID LEPROSY:
? firm, succulent papules or
nodules ON rather than within
the skin.
? relapse, primary dapsone
resistance and rarely de novo
also in LL.
? They have a characteristic
histology of bundles of
spindle cells a la
dermatofibroma
? highly bacillated
but
WITHOUT globi.
Leprosy: Some Imp
Details
? Deformities are
major cause of
morbidity with
leprosy. Hand
deformities include
mainly claw hand
(Ulnar nerve
paralysis). Foot drop
is commonest
complication in foot.
? trophic ulcerations.
Type-1 Lepra Reaction
? erythema, edema, and
tenderness of the existing
skin lesions without new
lesions
? In downgrading type some
new lesions may appear
? Resolving lesions
desquamate
? Neuritis is the major
complaint and can lead to
significant deformities.
? Sometimes there is SILENT
neuritis
Type-2 lepra reaction
? Systemic features are
SEVERE: fever, malise,
arthralgias, Myalgias
? Cutaneous lesions: ENL:
multiple, symmetrical,
tender, erythematous,
S/C nodules in CROPS on
face, extremities and
trunk.
? They heal in 3-7 days
with bruise like changes
? Existing skin lesions
remain unchanged
ATYPICAL MYCOBACTERIAL CUTANEOUS
INFECTION:
? M. marinum: Swimming
pool granuloma or Fish
Tank Granuloma
? C/F: Red-brown asymptomatic
papules which enlarge into
plaques with verrucous surface
at the site of inoculation
(extremities) in individuals
working with aquarium etc,
usually without LN
enlargement but sometimes
spread along lymphatics gives a
sporotrichoid pattern.
? Rx: ATT poorly effective.
Minocycline is most effective
drug.
ATYPICAL MYCOBACTERIAL CUTANEOUS
INFECTION:
? M. ulcerans: Buruli ulcer:
? Develops as a painless SC swelling
which ulcerates to form a painless,
deeply undermined grossly
necrotic ulcer with exposure of
underlying fat usually present on
extremities and persisting for
years without LN enlargement
? Malnourished/ immunosuppressed
? Rx: ATT ineffective. Excision and
grafting may be required though
Rifampicin and TMP-SMX may be
effective.
Primary TB
TB Chancre :
? 5% of Cutaneous TB (rare)
? Cut. analog of pulmonary
Ghon's complex (skin lesion
and draining lymph node)
? Well defined painless nodule
breaking down to a non-
tender ulcer with undermined
edges occurring on extremities
and face in mainly children
following a penetrating injury
associated with regional LN
enlargement (3-8 weeks).
Secondary TB
Lupus
vulgaris
? Usually solitary, asymptomatic, well defined, red-
brown annular plaque
? extends peripherally with central atrophy and
scarring and an advancing and a receding edge.
? Sentinel lesions
? The lesion is soft on probing (gelatinous consistency)
and diascopy reveals apple-jelly nodules)
Secondary TB
TBVC
(Tuberculosis
verrucosa cutis)
Syn: prosecutor's
wart, anatomist's
wart
? Secondary re-infection TB in a patient with
good immunity
? seen on exposed sites (feet > hand).
? Irregular, verrucous red-brown plaque with
rough horny surface and deep clefts and
fissures with crusting and purulent discharge.
? LN spared unless secondarily infected.
Secondary TB
Scrofuloderma :
Syn: TB
Colliquativa Cutis,
King's Evil
? MC Cut. TB in India.
? Secondary reactivation tuberculosis spread by contiguity.
? A pre existing TB focus (Lymph Node MC, bone ,
joint, tendon, lacrimal apparatus etc) breaks through the
overlying skin to form a characterstic painless TB ulcer
(sinus) with bluish margins and undermined edges.
? The ulcer (sinus) is fixed to underlying structure (eg.
LN).
? Heals with puckered or cord-like scars.
Secondary TB
TBCO
(Tuberculosis cutis
orificialis)
? Rare TB of mucosal orifices and adjacent skin in
patients with advanced visceral (Genitourinary,
gastrointestinal and pulmonary) TB due to
autoinoculation.
? Clinically presents as PAINFUL shallow ulcers at
the skin near mouth, anus, and urethral meatus.
TUBERCULIDS
Lichen
scrofulosorum:
? Grouped lichenoid papules with perifollicular
pattern over the trunk.
? found in children or young adults
? Sweat gland and perifollicular epitheloid cell
granuloma without caseation
Bacterial Infections
? ERYSEPLOID: rare infection caused by Erysiplothrix in
fisherman, butchers presenting as painful, tender, erythematous
lesion with a purplish hue.
ERYTHRASMA:
? Corynebacterium
minutissimum.
? reddish-brown, scaly and
finely wrinkled macules
in Axillary and
genitocrural areas.
? characteristic "coral-
red" fluorescence under
Wood's light.
? Rx: 1) Oral erythromycin
2) Topical : clindamycin,
whitfield's ointment or
miconazole
Pityriasis versicolor:
Clinical Picture
KOH: Sphagetti & Meatball
Tinea nigra
? Exophiala
(Phaeoannellomyces)
werneckii
? Brown or black
asymptomatic annular
lesions
? Palms/ soles
? Western Hemisphere
? Rx: topical keratolytics
(sulfur/ salicylic acid),
scraping, antifungal
Piedra
? superficial infection of hair shaft
? Nodules along the hair-shaft: nodule is the ascomycete fruiting
body of the fungus, know as an ascostroma
? In tropics
? does not fluoresce under Wood's light
?
Trichosporon beigelii
white Piedra
easily detached
? Piedra hoartae
black Piedra
very adherent
? Rx: SHAVING, salicylic acid, Azoles, Formalin shampoos
Tinea capitis
? ECTOTHRIX
? ENDOTHRIX
Tinea capitis: NON-Inflammatory
CATEGO CLINICAL APPEARANCE
RIES
Grey
?Ectothrix
patch
?Microsporum sp.
?Greenish fluroscence
?one or several patches of scaly
scalp with hairs broken just
above the level of the scalp
?hair is lusterless and gray
( covered with arthrospores)
"Black
?Endothrix
dot"
?T.tonsurans, violaceum
?hairs are notably fragile and
break easily at the level of the
scalp looks like "black dots".
Tinea Capitis: Inflammatory
? KERION:
? Severe tender, inflammatory,
boggy, cystic swelling with easily
plucked hair
? Caused by zoophilic organisms (M.
canis, M. nanum, T. equinum, T
mentagrophytes var.
mentagrophytes)
? Scarring alopecia
? Agminate folliculitis:
? Less severe inflammation than
kerion with sharply defined, dull
red plaques studded with follicular
pustules.
? Caused by zoophilic species
Tinea Capitis: Inflammatory
? FAVUS: honeycomb
? T. Schoenleinii
? Jammu & Kashmir
? cup shaped yellow scutula coverd
with crusts & foul smell
? endothrix-style growth, but
without the arthrocondia
? channels are formed within the
hair shaft
as air bubbles move
along these channels in KOH
mount
? Woods lamp: bluish fluroscence
? Scarring alopecia
T facei/ barbae
? Facei: children, females:
? Sharply marginated,
erythematous, scaling, and
crusted plaques Note
asymmetry.
? May be associated with T.
capitis
? Barbae:
? adult males
shaving with
infected material
? closely resembling tinea capitis,
with invasion of the hair shaft.
? Pustular folliculitis
? Easily removable hair
? Rarely KERION
? Tinea Incognito: Picture
modified by steroid application.
T. corporis/ cruris
? Annular lesions with
peripheral enlargement and
central clearing & scaling,
sharply marginated plaques
with or without pustules or
vesicles, usually at margins.
? fusion of lesions produces
gyrate patterns.
? T. rubrum
CRURIS: Synonym: "Jock
itch" , Dhobi itch"
? similar lesions in groin area
T. mannum
? unilateral (dominant) scaling
particularly in the skin creases
and the nails are usually
involved
? "one hand, two feet"
distribution is typical of
epidermal dermatophytosis of
the hands and feet.
? After treatment, recurs unless
onychomycosis of fingernails,
feet, and toenails is eradicated
? Fissures and erosions provide
portal of entry for bacterial
infections
T. pedis (Athlete's foot):
? infection of the toe web-spaces
and the soles.
?
There are 3 main clinical
patterns.
? Chronic Plantar Scaling = Dry or
"Moccasin" type.
? Bullous Tinea
Pedis: Sudden
eruption of pruritic or painful
vesicles on the soles. The eruption
is usually unilateral. It is usually
caused by T. Mentagrophytes.
?
Interdigital Tinea Pedis: Peeling,
maceration and fissuring occurs
frequently in the lateral toe clefts
(4th and 5th).
Onychomycosis (T. Unguium)
? Etio: T. rubrum (MC).
? Types:
?
(1)DSO (MC):
? Initial Infection of Nail bed and
hyponychium.
? distal nail edge onycholysis with
subungual debris, subungual
hyperkeratosis and
discolouration
? (2) PSO (LC):
? Nail fold
nail plate
? IMP: Seen Mostly in
IMMUNOCOMPROMISED AND
HIV.
? Rx: DOC: TERBINAFINE X 6-
12 weeks [Griso: 6 (fingernail)-
12(toenail) months].
Candidiasis
? moist, flexural sites.
? Pustules (Sattelite) at the edges are
characterstic. Shows Psedohyphae in
KOH prep.
? more common at the extremes of age and
during pregnancy.
? Predisposing factors:
? diabetes mellitus, pregnancy,
? broad-spectrum antibiotics,
? obesity, dentures,
? Cushing disease, uremia,
? malignancy and immunodeficiency.
Topical treatment
Nystatin, imidazole cream, amphotericin
lozenges (in oral candidiasis =swish and spit)
Systemic treatment: AMP- B DOC in
disseminated Candidiasis. Oral fluconazole,
itraconazole, ketoconazole
?
SPOROTRCHOSIS
? ETIO: Sporothrix schenckii (Dimorphic)
? C/F:
? patients working with plants and farmers
? follows penetrating injury by plant product
(thorn)
? months after the injury there is
subcutaneous nodule which breaks down to
form chronic ulcer ( Fixed Cutaneous
Sporotrichosis =15%)
? Lymphangitic form (85/%) is characterized
by appearance of a chain of similar dermal
nodules along the drainig lymphatics in a
linear configuration (Sporotrichoid pattern)
? Other sporotrichoid infections: M. marinum,
kansasii
? LAB: Biopsy shows foreign body granuloma
with cigar shaped bodies and asteroid
bodies surrounded by eosinophilic material.
? TREATMENT: Saturated Sol. of KI.
PEDICULOSIS CORPORIS
? affects the poor and neglected and
flourishes in overcrowded, dirty situations
Transmission is mainly by direct close
body contact or by sharing infested
clothing
? seen on the clothing only (NOT on
body) esp. the inner lining of clothing
including the seams of underpants..
? Intense pruritus
? Excoriation with secondary bacterial
infection and hyperpigmented changes
are common.
? predilection for the upper back.
? Treatment: It is the clothing rather
than the patients which require
treatment
Laundering or boiling the
clothing and bedding is essential. The
patient should bath thoroughly with soap
and water.
PEDICULOSIS PUBIS:
? crab louse (Phthirus pubis)
? confined to the pubic and
anal hair, but in hirsute or
heavily infested patients, the
chest hair, arm and leg hair,
as well as the axilla, beard and
eyelashes can be infested.
? attach themselves to hairs
with their strong back legs
? The nits attach themselves
to the hair and probably are
nourished by apocrine
secretion.
PEDICULOSIS PUBIS:
? all classes of society, as opposed
to other varieties of lice
? sexually transmitted disease
although this is not always the case.
? Blue black colored pigmented macule
on the sides of trunk and inner aspect
of thighs (Maculae ceruleus=
taches Bleues= Tache Bleu?tres)
may be present.
? Rx:
? pt + sexual partners
? Screen for other STDs
? SHAVING THE HAIR
? Permethrin, lindane
? Eyelids: permethrin or physostigmine
or petroleum jelly
PAPULAR URTICARIA:
? PAPULAR URTICARIA
(lichen urticatus) is a
hypersensitivity reaction
pattern to insect/arthropod
bites like mosquitoes, bed
bugs, other insects seen in
rainy season etc.
? multiple, itchy, reddish and
excoriated papules
? on exposed parts of body
? recurrent
? mainly in children.
Cutaneous leishmaniasis
? OLD WORLD: (L. major, L. tropica):
? Vector: sandfly Phlebotomus.
? Purely cutaneous form also known as
Baghdad Boil, Oriental Sore, Delhi
Boil, Kandahar sore and Lahore Sore.
(pt. from Rajasthan)
? Exposed skin of face and extremeties
? It is of two types viz. moist or rural type
characterized by ulcer formation and dry
or urban type with non ulcerating
chronic erythematous, succulent and
infiltrated nodules
? Lesions may become annular with central
clearing, scarring and crusting
VOLCANO sign
Post Kala-azar Dermal Leishmaniasis
(PKDL)
? L. donovani
? many years after
incompletely treated
visceral Leishmaniasis
patients develop either
? (a) macular hypo or
depigmented macules on
face, arms and upper trunk
simulating LL Hansen's or,
? (b) Warty, infiltrated
papular lesions in the
central area of face near
nose and mouth (Muzzle
sign).
Dermatological diagnostics
? Acetowhitening: subclinical
condylomata acuminata.
? Diascopy (VITROPRESSION):
? distinguish erythema from purpura
?
Apple Jelly Nodules: Lupus vulgaris
? Darier's sign: urticaria pigmentosa
(cutaneous mastocytosis)
? Grattage test & Auspitz's sign:
slight scratching of a scaly lesion
reveals
? initially fine scales
? candle wax scales
? red Berkley's membrane;
? punctate bleeding points (Auspitz
sign)
? suggests of psoriasis. (others: Darier's
disease and actinic keratosis)
Dermatological diagnostics
? Nikolskiy sign : an
indicator of active
acantholysis distinguish
between intraepidermal
and subepidermal
blistering diseases
? Pemphigus (vulgaris/
foliaceous)
? S.S.S.S.
? epidermolysis bullosa
? toxic epidermal necrolysis/
SJS (Pseudo Nikolskiy)
Dermatological diagnostics
? Antenna sign:
grossly plugged
follicular prominances
showing a long strand
of keratin protruding
when examined in
light seen in Keratosis
Pilaris.
? Buttonholing sign:
NF 1 (with central
vertical pressure the
lesion disappears
under the skin)
Dermatological diagnostics
Carpet Tack Sign: or carpet en tack sign: removal of
adherent scales in DLE reveals downward projection of scales
which are follicular plugs
? Dimpling sign:
dermatofibroma.
Dermatological diagnostics
? Koebeners' Phenomenon:
Spread of lesions of same
morphology (isomorphic
phenomenon) at the site
of trauma. Characteristically
seen in Lichen planus,
psoriasis, vitiligo and by
Auto-inoculation in Verruca,
Molluscum contagiosusm
? Dermographism: Physical
urticaria, Normal
? White Dermographism:
AD
Annular/ Figurate lesions:
? Granuloma annulare:
annularly arranged papules
over dorsum of hands in
diabetes.
? Erythema annulare
centrifugum: variable causes,
supposed to be a
hypersensitivity reaction to
many causes including drugs,
infections and malignancies.
Lesions spread centrifugally
while clearing in center at a
rate of around 5 mm/day with
a characteristic trailing
scale.
Arrangement of lesions
? Erythema multiforme:
Target lesions, drugs and
herpes/mycoplasma
infections.
? Erythema chronicum
migrans: In Lyme's
disease small papules
develop into gradually
enlarging annular lesions
and clearing from center
and is long lasting (1-3
months).
Arrangement of lesions
? Erythema gyratum
repens: Associated
?Erythema
with malignancies with
marginatum: In
rheumatic carditis
wood grain pattern of
erythematous annular
rings. Most common :
plaques develop on
LUNG Ca
mainly trunk and
extensor extremities
Most characterstic:
which are transient
and keep on coming
Breast Ca
and going
? Necrolytic Migratory
Erythema: Seen in
Glucagonoma.
PITYRIASIS RUBRA PILARIS:
An uncommon cause of
erythroderma, where the
underlying defect is
abnormal keratinisation:
? Palmoplantar keratoderma
(PRP Sandal)
? Red (salmon colored)
patches with islands of
sparing
? Papules: perifollicular
hyperkeratotic over dorsum
of hands and trunk
Reiter's disease
? KDB
? Circinate
balanitis
SJS/ TEN
SJS
TEN
DERMATOMYOSITIS (DM)/ (PM)
SKIN: photosensitive rash
? Pathognomic skin
findings:
? GOTTRON'S PAPULES:
Small violaceous to red,
flat topped papules with
central depression over
dorsal IP and MCP
joints.
? GOTTRON'S SIGN:
Confluent macular
violaceous erythema
(CMVE) over the same
sites, Elbows, malleoli
etc. (IMP: in SLE the
CMVE SPARES the
joints)
DERMATOMYOSITIS (DM)/ (PM)
? Characteristic skin findings:
? HELIOTROPE Rash: violaceous
or purplish periorbital erythema
and edema
? Nail fold telangiectasia and
cuticle-dystrophy
? V sign: CMVE in the V area of
neck; SHAWL sign: CMVE over
shoulder girdle
? Linear CMVE on dorsum of
hands tracking along the
tendons (Dowling's lines)
? MECHANICS' hand: non
pruritic, hyperkeratotic,
symmetrical, fissured, scaly
and hyperpigmented hands.
DLE: CHRONIC CUTANEOUS LE (CCLE)
Scleroderma: MORPHEA
? Cutaneous sclerosis
alone without systemic
involvement.
? Ivory colored plaques
with a peripheral rim of
violaceous color and the
surface is shiny, smooth
and bound down with
loss of hair (Scarring
Alopecia) and sweat
glands and in late
stages even nerves
Scleroderma: MORPHEA
Types:
? Circumscribed or localized:
usually on trunk.
? Linear scleroderma: upper or
lower extremity especially in
children.
? Frontoparietal (en coup de
sabre): linear scleroderma
occurring on the head with or
without hemiatrophy of face. PARRY
ROMBERG SYNDROME: [SAFE]
Seizures, Alopecia, Facial
hemiatrophy Exophthalmos
Scleroderma: MORPHEA
? Generalized morphea:
widespread morphaeic plaques
over trunk and limbs.
? Pansclerotic (Morphea
profunda): involvement
(trunk, extremities, face, and
scalp, with sparing of
fingertips and toes) of
dermis, fat, fascia, muscle,
bone. Mostly seen with linear
morphea. Can lead to severe
contractures and disability.
LICHEN SCLEROSUS ET ATROPHICUS (LSA):
? atrophic, porcelain-
white, angular, well-
defined, indurated
papules or plaques,
and characteristic follicular
dilatation & keratotic
plugs, known as dells
occurring most commonly
on the ANOGENITAL
SKIN of both sexes. It is
more common in females
than males (10:1).
? The epidermal changes
differentiate it from
morphea.
Fixed drug eruption
? Drugs commonly
implicated:
? Persistent purplish
? Barbiturates
? OCP
erythema that lasts 4-8
? NSAIDs
BOND
weeks, can be bullous
? Foscarnet (penile
ulcers)
Fixed
and recurs at the same
? Sulfonamides
Shiny
? Phenolphthalein
spot on taking the
PAD
? Allopurinol
drug again
? Dapsone
? Heals with
hyperpigmentation
? Genitals and acral
extremities
Xeroderma pigmentosum: (AR)
Melanopenic diseases
? Nevus depigmentosus
(Achromicus): stable,
congenital, off-white
macules, unilateral, may
have rounded borders or
irregular along lines of
Blaschko but usually without
underlying skeletal or other
abnormality.
? Hypomelanosis of Ito:
bilateral, along embronal skin
fusion lines (Blaschko's
lines), marble cake
pattern or fountain-spray
pattern; 60 to 75% have
systemic involvement--CNS,
eyes, musculo-skeletal
system.
Dermal Melanocytosis: Hamartomas
? Nevus of Ota: periorbital speckled slate gray
pigmentation
PERSIST
? Nevus of Ito: similar pigmentation of the
acromioclavicular areas: PERSIST
Dermal Melanocytosis: Hamartomas
? Mongolian Spots: congenital gray-blue
macular lesions, which are characteristically
located on the lumbosacral area in ~80%
of Asians and disappear in early childhood
Nutritional dermatoses:
? Kwashiorkor:
? Flaky or enamel paint
dermatosis and flag sign
? Vit A defeciency and
EFA def:
? PHRYNODERMA
? Riboflavin def:
? Deficiency causes
Keratoconjunctivitis,
Angular stomatitis,
Chelitis, Perleche and
smooth tongue. It can
also cause genital scaly
and patchy rashes.
(Oro-Oculo-Genital
syndrome).
Nutritional dermatoses:
? Niacin def: pellagra:
? Diarrhoea, Dermatitis and
Dementia
? symmetric, photosensitive and
photo-exacerbated rash
? initially diffuse erythema with
itching
vesicles which lead
to heavy, Dry-Brown crusting,
Hyperkeratosis and
lichenification on being
ruptured.
? The rash on neck is called
"Casal's Necklace" while that
on the dorsum of hands are
called the "Glove" or
"Gauntlet" of Pellagra.
(Similarly Boot of Pellagra
over feet.)
Nutritional dermatoses:
? Vit C def: SCURVY
? Hemorrhagic signs: includes
hemorrhagic gingivitis,
perifollicular petechiae and
subperiosteal hemorrhages
leading to pseudoparalysis in
childhood.
? Hyperkeratosis of hair follicles:
Presents as rough, pointed,
follicular papules the hair of
which has a "swan-neck" or
"Cork-Screw" appearance
mainly over upper arms,
buttocks, thighs, calves, shins
etc.
? Hematologic abnormalities:
Anemia, capillary fragility test
etc.
Nutritional dermatoses:
? Zn def: Acrodermatitis
enteropathica (AR)
? Diarrhea, Alopecia and Dermatitis
? periorificial & acral moist, crusted with
large erosions and peripheral scales.
? Low serum zinc levels but inc on oral
dosing
? ZEBRA STRIPED Hair
Necrobiosis lipoidica diabeticorum
? More common in young female
diabetic patients.
? symmetrical, well defined,
irregular, brown-red plaques
on both shins and feet.
Sometimes, it may appear on the
face, arms and trunk. The
epidermis is atrophic and
delicate vessels occur over the
surface. Chronic stage may
present as Ulcers.
? Treatment : unsatisfactory; I/L
steroids
? Does not correlate with
normalization of hyperglycemia.
Pseudo Xanthoma Elasticum
? Defective elastin
? distinctive peau d'orange
surface pattern resulting
from closely grouped
clusters of yellow
(chamois-colored) papules
in a reticular pattern on the
neck, axillae, and other
body folds
? Angioid streaks and
hemorrhages in retina
Neutrophilic dermatosis
? Pyoderma
gangrenosum
presents with chronic
painful ulcers with
irregular geographical
borders
? MC on legs
? Associated with Ulc.
Colitis and Crohn's
Neutrophilic dermatosis
Sweets Syndrome:
? Associated with
? Idiopathic
? Infections
? Drugs
? Malignancies (leukemias)
? IBDs & other autoimmune diseases
? Pregnancy
? Acute, Febrile neutrophilic dermatosis
? Skin lesions are tender, erythematous
asymmetrical papulo-nodules which at times
may look pseudovesicular
? Wonderful response with STEROIDS & Potass.
Iodide
Neurofibromatosis-1
STURGE- WEBER syndrome
Tuberous Sclerosis Complex
Ichthyosis
? Lamellar Ichthyosis
? AR
? Defective
TRANSGLUTAMINASE
? ABSENT GRANULAR layer
? Onset within 1 yr/birth
? Plate like thick brown
scales
? Scarring with ectropion
etc possible
This post was last modified on 03 August 2021