Question:
An ulceronecrotic nodule is characteristically seen in which type of leprosy?
An ulceronecrotic nodule is characteristically seen in which type of leprosy?
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Necrotic ulcers with black eschar on the legs - the Lucio phenomenon.
Updated On: Jun 24, 2026
- Lucio leprosy
- Lepromatous leprosy
- Indeterminate leprosy
- Histoid leprosy
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The Correct Option is A
Solution and Explanation
Step 1: The ulceronecrotic lesion described is the Lucio phenomenon, a severe type-2 lepra reaction occurring in Lucio leprosy (diffuse non-nodular lepromatous leprosy), seen mainly in Mexico.
Step 2: Clinically it presents as painful tender red patches, especially on the extremities, that turn necrotic and form brown-black eschars, with ulcers being persistent on the legs.
Step 3: Why the others are wrong. Indeterminate leprosy shows only a hypopigmented macule with sensory impairment, not ulceronecrotic lesions. Histoid leprosy gives shiny erythematous cutaneous or subcutaneous nodules over the extensors, back, buttocks and face, but ulceration is unusual.
Step 4: Therefore the ulceronecrotic nodule is seen in Lucio leprosy.
Step 2: Clinically it presents as painful tender red patches, especially on the extremities, that turn necrotic and form brown-black eschars, with ulcers being persistent on the legs.
Step 3: Why the others are wrong. Indeterminate leprosy shows only a hypopigmented macule with sensory impairment, not ulceronecrotic lesions. Histoid leprosy gives shiny erythematous cutaneous or subcutaneous nodules over the extensors, back, buttocks and face, but ulceration is unusual.
Step 4: Therefore the ulceronecrotic nodule is seen in Lucio leprosy.
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