Dermatology Flashcards
what is the alternative name for ‘athlete’s foot’?
tinea pedis
what are the risk factors for Tinea Pedis?
- wearing shoes, getting warm and sweaty
- locker room floors
- repeated exposure
what are the signs of tinea pedis?
interdigital (in the toe webs)/plantar, hyperkeratotic, erythematous lesions
can be either dry and scaly or wet and soggy
sometimes in ring worm pattern
may have onychomycosis
how do you distinguish tinea pedia from eczema on the foot?
eczema is bilateral whereas tinea pedis is more often unilateral
what is an “Id reaction”?
an allergic response to fungus, causing vesicles in the area or on arms, chest and sides of fingers
how do you manage tinea pedis?
butinafine/terbinafine (antifungal)
sertaconazole/econazole (antifungal)
lotrisone (antifungal + cortisosteroid)
What is this?
interdigital tinea pedis
what is the mdeical tword for “senile warts”?
seborrhoeic keratosis
what is this?
seborrhoeic keratosis
describe the typical appearance of a seborrhoeic keratosis.
“stuck on”, waxy, verrucous, velvety papules and plaques with a variety of colours
What is this?
syringoma
where are the two most common areas for syringomas?
- inferior eye lid
- vulva
What is this?
syringoma
what is the most common skin cancer?
Basal cell carcinoma (BCC)
define BCC.
cancer of non-keratinizing cells in the basal layer of the epidermis
describe the pcommonest presentation of a BCC
translucent papule/nodule with telangectiasias, rolled borders, may have ulceration.
what is this?
BCC
what is this?
nodular BCC
what are the classifications of a BCC?
- nodular BCC
- pigmented BCC- ddx = nodular melanoma
- superficial BCC: isolated patch of ezcema which does not respond to treatment
What is the diagnosis?
roseola infantum
what is exanthem subitum?
roseola infantum
what is the presentation of roseola infantum?
high fever in 6-36 months old child, when the fever subsides a rose-pink maculopapular rash appears on the face, trunk, neck and extremities
what causes roseola infantum?
HHV7/6
what is the most important differential diagnosis for fever and rash in a child?
bacterial meningitis
how do you manage roseola infantum?
manage the fever with cool sponge baths and/or acetaminophen
what is atopic dermatitis?
eczema
what is the most common type of psoriasis?
plaque psoriasis
what is the Koebner phenomenon?
when injury/irritation induces psoriasis at the site.
what is the diagnosis?
plaque psoriasis
what is the diagnosis?
eruptive psoriasis
what is the commonest presentation of plaque psoriasis?
red , sharply defined plaques with a silvery scale on the scalp, elbows, knees, plams, glans, penis, vulva, intergluteal fold and other flexures.
Antoher sign is nail pitting.
what is the diagnosis?
eczema (atopic dermatitis)
what is the diagnosis?
eczema (atopic dermatitis)
what is the diagnosis?
molluscum contagiosum
what are the features of molloscum contagiosum?
red pustules, looks like little snails with central umbilication
lesion moves slowly as a result of self-innoculation
can be sexually transmitted
how do you manage molloscum contagiosum?
self-resolving
what causes molloscum contagiosum?
pox-virus
what does herpes simplex virus cause?
cold sores
what does herpes zoster cause?
shingles and chicken pox
what are the features of herpes zoster (shingles)?
pain in dermatomal region, then a red, painless, vesicular rash in dermatomal region
what is the diagnosis?
pityriasis rosea
what are the features of pityriasis rosea?
“christmass tree” distribution, of a red, fine bran-like surface/fine scale
how do you manage pityriasis rosea?
self-resolving
what is the diagnosis?
scabies
what are the features of scabies?
burrows in skin, with allergic reaction to eggs
