Dermatology Flashcards
what rash is made worse with sun exposure?
lupus
which rashes are made better with sun exposure?
eczema + psoriasis
characteristics of lesion in epidermis?
scale, cracking, oozing fluid
characteristics of lesion in dermis?
skin smoothed but raised surface
difference between ulcer + erosion
erosion = partial loss of epidermis, no scarring
ulcer = full loss of epidermis, scarring
what is eczema?
inflammatory condition of skin
reaction to insult - either external or internal (immune system)
exogenous or endogenous
what 2 types of hypersensitivity reaction can allergic contact eczema?
type IV or I
how to determine between type I + IV hypersensitivy?
IV = delayed = path test
I = immediate = skin prick (anaphylaxis)
what is lichen simplex?
eczema due to scratching
what are oral lichenoid inflammations caused by?
autoimmune destruction of epithelium
3 type of of oral lichenoid inflammation?
- lichen Planus
- lupus
- erythema multiforme
2 types of oral inflammatory skin manifestations?
lichenoid inflammation
granulomatous
2 types of oral blistering?
pemphigus + pemphigoid
characteristics of lichen Planus?
whitish
reticulate
what syndrome can cause erythema multiform?
Steven Johnsons syndrome
difference between pemphigus + pemphigoid?
pemphigus = intraepidermal, easily rupture pemphigoid = sub epidermal, don't rupture easily
2 causes for oral blistering?
- mechanobullous
2. autoimmune immunobullous
what characteristic of lichen Planus make it suspicious?
atrophic or erosive
non-heterogenous areas of change
what is oral sub mucous fibrosis?
premalignancy
palate + buccal mucosa appear white
severe trismus + dysphagia
hyperkeratosis + atrophy (hard)
what is sideropenic dysphagia?
premalignancy
associated with paterson brown Kelly or Plummer Vinson
glossitis
due to iron deficiency - hypo chromic anaemia
dysphagia
what is a leukoplakia?
predominantly white are of oral mucosa, can’t be classified as anything else, questionable risk
what is erythroplakia?
predominantly red are of oral mucosa, can’t be classified as anything else, questionable risk
is Leuko or erythro plakia more worrying?
erythro
most common oral skin cancer?
SCC
what is candidal leukoplakia?
type of chronic hyper plastic candidosis
severe dysplasia with candida infection on top
where is the squamous layer of skin?
above basal layer in ep - also known as stratum spinosum
do BCC or SCC grow quicker?
SCC
