Erythema Nodosum

Question 1

What is erythema nodosum. (2)

Answer 1

Tender, erythematous nodules which resolve after 6 weeks.

Question 2

What is erythema nodosum not associated with.

Answer 2

Scarring.

Question 3

Where does erythema nodosum occur. (2)

Answer 3

On the shins.

also thighs and arms

Question 4

What are the causes of erythema nodosum. (5)

Answer 4

Infection (streptococcus, tuberculosis).
Sarcoidosis.
Inflammatory bowel disease (Crohn’s disease, ulcerative colitis).
BCG vaccine.
Leptospirosis.
Yersinia (and other viruses and fungi).
Drugs (sulfonamides, dapsone, the pill).
Idiopathic (30-50%).

Question 5

What do the lesions of erythema nodosum look like. (3)

Answer 5

Painful, blue-red, raised lesions on shins (and arms and thighs).