This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
Ulceronecrotic nodule is seen in ? 
Select and explain. 
A. Lucio leprosy, B. Lucio leprosy, C. Indeterminate leprosy, D. Histoid leprosy
A: Lucio leprosy
Answer: A: Lucio leprosy 
Explanation: Ans. is 'a' i.e., Lucio leprosy Lucio phenomenon It is found in lucio leprosy with type 2 lepra reaction. It is prevalent in mexico. Characterized by painful tender red patches paicularly on extremities which later on become necrotic and finally develop into brown black eschar. Ulcers are more persistent on legs. Tuberculoid and indeterminate leprosy are characterized by hyperpigmented macule with impairment of sensations. In histoid leprosy, classical feature is erythematous shiny red subcutaneous or cutaneous nodules, esp over the extensor aspect of extremities, back, buttocks & face. Ulceration is unusual.