A case report of de novo histoid leprosy in a Nigerian male: A diagnostic dilemma.

Histoid leprosy is an uncommon variant of lepromatous leprosy. It poses a diagnostic challenge because of its distinctive clinical and histopathological features. It presents as smooth papules and nodules that rarely ulcerate. We present the case of a 22-year-old Nigerian man with a 2-year history of multiple, dome-shaped papules and nodules on the skin with necrotic centres. General examination showed right axillary lymphadenopathy, non-pitting oedema, foot ulcer, and glove and stocking sensation loss. Despite previous misdiagnoses, histopathological examination showed dermal expansion by histiocytes arranged in a storiform pattern. Slit skin smear yielded abundant bacilli. The patient was started on WHO multidrug treatment, resulting in the improvement of his lesions. This case emphasises the importance of increased awareness of this rare presentation of leprosy.