Shin lesions

Question 1

Differentials of shin lesions

Answer 1

• erythema nodosum
• pretibial myxoedema
• pyoderma gangrenosum
• necrobiosis loidica diabeticorum (wtf haha)

Question 2

Erythema nodosum characteristics

Answer 2

• symmetrical, red, tender nodules
• heal without scarring

Question 3

Erythema nodosum causes

Answer 3

• streptococcal infection
• sarcoidosis
• IBD
• drugs (penicillin, sulphonamides, COCP)

Question 4

Pretibial myxoedema characteristics

Answer 4

• symmetrical, red lesions
• shiny, orange peel skin
• seen in graves disease

Question 5

Pyoderma gangrenosum characteristics

Answer 5

• initially small red papule
• later, deep necrotic ulcers with vulvatious border

Question 6

Causes of pyoderma gangrenosum

Answer 6

• idiopathic (50%)
• IBD
• connective tissue disorders
• myeloproliferative disorders