<prompt> Lucios phenomenon is seen in?Tuberculoid leprosyLepromatous leprosyBorderline leprosyBorderline Tuberculoid leprosy  <response>: Ans is b i.e. Lepromatous leprosy Lucios phenomenon is seen in untreated cases of lepromatous leprosy.Lucios phenomenon Lucios 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. 