Erythema nodosum leprosum in Nigeria.

The occurrence of erythema nodosum leprosum among leprosy patients treated with diamino diphenyl sulfone in an endemic area is not rare, unlike in the leprosy patients treated at Lagos University Teaching Hospital. Two Nigerian patients with this disease are described, in whom this rarity was seen. Recurrent monthly fever with painful skin swellings in lepromatous patients from an edemic area is highly suggestive of erythema nodosum leprosum. The occurrence of this reaction in lepromatous leprosy gives a relatively poor prognosis.