Dermatology Flashcards
What is Auspitz sign
Seen in psoriasis- pin point bleeding on scraping of lesions
What is demodex?
Mite involved in rosacea First line (mild) - topical ivermectin/metronidazole Mod-severe- doxycycline/oxydoxycycline If redness predominant- Brimonidine
Types of psoriasis?
Plaque and guttate
Distribution of psoriasis
Extensor surfaces
The Ps of Lichen planus
Purple
Polygonal
Pruritic
On flexor surfaces
Wgat is Breslow thickness? Its importance
Degree of invasion of BCC, determines its prognosis
Type of ulcer seen in basal cell carcinoma?
Rodent/pearl ulcer- central depression, raised edges
How do you treat cellulitis if the patient has a penicillin allergy?
Give an aminoglycoside- clarithromycin
What layer of the skin does celluilitis affect?
The dermis
Whats the dofference between cellulitis and erysipelas?
Erysipelas affects the upper skin (face-leg-arms) and has sharp borders.
Cause predominately by strep.
Both are however treated the same way
What pattern of lesion does lichen planus have in the mouth?
Where does it stay?
White lacy pattern
-wickham striae
Located at the sodes of the tongue and buccal mucosa
Can oral lichen planis be painful?
Yes. Its called Erosive lichen planus
How do you treat lichen planus?
Topical steroid (T cell mediated) and oral antihistamine (intensely pruritic)
How do you treat hives?
Limit antigen exposure
Antihistamines ( remember the culprit is histamine leading to vasodilation and leaky vessels)
Calamine lotion
Oral steroids if needed
Distribution and appearance of psoriasis?
Extensor surfaces, well demarcated plaques with ovelying white/silver film/scales
Very itcy
Treatment of psoriasis
Emollients
Topical steroids
Vit D analogues
2nd line- PUVA
Difference between psoriatic arthritis and RA?
RF is negative
Commonly affects DIP jt
Atopic dermatitis features?
Occurs in flexures of the body
Usually in response to an allergen
History of an atopic disease- asthma, hay fever
Treatment of atopic dermatitis
Emollients + topical steroids
Mild steroids- hydrocortisone acetate
Moderate- Betamethasone 0.025, clobetasone
Potent- Betametasone 0.1%, mometasone furoate, hydrocortisone
Very potent- Clobetasol
Distribution of Seborrheic dermatitis
Occurs in areas with sebaceous glands- trunk, face, scalp
Treatment of seborrheaic dermatitis
Ketoconazole, selenium shampoos
Steroid cream in severe cases
Also, topical antifungals
Ehat is thepathophysiology of seborrheic dermatitis
The body reacts to the presence of malassezia in the sebaceous glands
Liche sclerosus
White plaques over the anogenital region- anus, labia, glans, etc
What is the ABCDE of malignant melanoma?
A- asymmetry B- irregular borders C- comour change/irregularity D- Diameter >/= 7mm E- Evolving
What to do when you see malignant melanoma?
Refer urgently to dermatology!
