Other skin disordrs

Question 1

Acanthosis nigricans

Answer 1

Epidermal hyperplasia
Hyperinsulin (diabete, obesity, Cushing)
Visceral malignancy

Question 2

Actinic keratosis

Answer 2

Premalignant lesion by sun exposure

Small, rough, erythematous or brownish papulle

Increased risk of SCC proportional to dysplasia

Question 3

Erythema nodosum

Answer 3

Inflammatory lesions, usually on anterior shin
Sarcoidosis,
Coccidiomocosis
Histoplasma
TB
Stretococcal infection
Leprosy
Crohns

Question 4

Lichen Planus

Answer 4

Pruritic,
Purple
Polygonal Planar Papules

Sawtooth infiltrate of lymphocyte at dermal epidermal

Associated with HepC

Question 5

Pityriasis rosea

Answer 5

Herald patch followed days later by Christmas tree distribution

Multiple plagues with collarette scale

Self resolving in 6-8 wks

Question 6

Sunburn

Answer 6

UVA: dominant in tanning and photoaging
UVB: sunburn

Can lead to impetigo, skin cancer.