Skin eruptions

Question 1

Erythema multiforme

Answer 1

1. Target lesions
2. Idiopathic, 33% HSV
   Barbiturates, penicillin causes

Question 2

Erythema nodosum

Answer 2

1. Red raised tender nodule, LL (shin)
2. Sarcoidosis
   Chrons
   CA
   TB, Leprosy, fungal, bact, chlamydial, viral, strep
   Preg
   Sulfonamide, tetracycline, OCP
3. Inv- FBC, ESR/CRP, Strep serology (ASOT), Mantoux
   M imp - CXR for sarcoidosis
4. Rx: leg elevation, NSAID, steroid

Question 3

*Shingles

Answer 3

1. HZV
2. Burninig, painful, 1-2 dermatomes
3. Mx:
   Antiviral given when-
   <72hrs presentation
   Genitals involved
   Immunocompromised
   Severe pain - also steroid

Question 4

Post herpetic neuralgia

Answer 4

1. Pain >3 months
2. Rx - TCA (Amitryptaline/pregabalin/gabapentin