Lucio's phenomenon is seen in?

Ans is 'b' i.e. Lepromatous leprosy * Lucio's phenomenon is seen in untreated cases of lepromatous leprosy.Lucio's phenomenon* Lucio's phenomenon is seen in lepromatous leprosy (LL). It occurs in patients who are untreated. Patients develop recurrent crops of large sharply marginated, ulcerative lesions, particularly on lower extrimities. It is due to heavy parasitism of endothelial cell, endothelial proliferation and thrombus formation which lead to ischemic necrosis.