Derm Q's

Question 1

epidermal inclusion cysts

Answer 1

aka sebaceous cyst
*firm, mobile swelling with central punctum
*cheesy discharge when incision and drainage

Question 2

tinea corporis

Answer 2

aka ringworm
*disseminated in pts with low immunity
*itchy confluent, scaly annular plaques

Question 3

atopic dermatitis

Answer 3

aka eczema
*skin barrier dysfunction
*itchy, dry skin –> face, truck and extensor surfaces in infants and flexural surfaces in older children and adults

Question 4

tinea cruris

Answer 4

jock rash
*scaly, pruritic annular rash in groin area
*microscopy –>segmented hyphae
*reexposure is common inspect skin for other areas of infection

Question 5

Porphyria cutanea tarda

Answer 5

disorder of haem synthesis
*deficieny in Uroporphyrinogen decarboxylase enzyme
*assoc with hep C, HIV, smoking
*triggered by alcohol and oestrogen meds
*sun exposed skin, painless, blistering and skin fragility

Question 6

Superficial burns

Answer 6

*only epidermis is affected
*erythematous, painful, no blistering, normal cap refill
*mgx:- clean wound, ointment, dressing

Question 7

Alopecia areata

Answer 7

• non itchy, patchy, non scarring loss of hair ( scalp, brows, body)
  *normal scalp
  *exclamation point hairs
  *ltd lesions treated with intraleisonal corticosteroids inj

Question 8

dermatofibroma

Answer 8

*firm, <1cm, hyperpigmented nodule
* > common in lower limbs
*central dimple when pinched

Question 9

urticaria

Answer 9

*intensely pruritic, well circumscribed erythematous rash/ wheals
*last < 24hrs but can keep recurring for unto 6/52

Question 10

molluscum contagiosum

Answer 10

*firm, flesh coloured, small, umblicated papule
*diagnosis is clinical.
*Mgx:- cryotherapy

Question 11

Squamous cell carcinoma

Answer 11

*firm scaly papule, nodule or plaque in sun exposed skin +/- ulceration
*poorly differentiated have beefy red papule

Question 12

hidradentitis suppurativa

Answer 12

*chronic recurrent folliculitis with subcutaneous nodules, abscesses, sinus tract formation and scarring
*Mgx:- prolonged abx tetracycline if fails surgery

Question 13

secondary angiosarcoma

Answer 13

*malignancy vasculoendothelial tumor complication of breast cancer
*appears after 4-8 yrs
*increased risk with radiation therapy and chronic lymphedema
*red bruise like plaque with purple papule
* biopsy Ix of choice

Question 14

keratoacanthoma

Answer 14

*rapidly progressive nodule with ulceration and keratin plug
*often has spontaneous regression/resolution

Question 15

pyoderma gangrenousum

Answer 15

*rapidly progressive painful ulcer with purulent base and violaceous margins
*assoc with IBD, rheumatoid arthritis, malignancy
*+/- hx of local trauma
*biospy:- mixed cellular infiltrate
*Mgx:- glucocorticoids