Leprosy

Leprosy, an infectious dermatosis caused by Mycobacterium leprae, is classified into 5 broad types according to the Ridley-Jopling classification. Tuberculoid leprosy typically presents with a few hypopigmented, anhidrotic patches with hypotrichosis (Fig 1).1 Borderline-tuberculoid leprosy often has multiple (10-20) hypopigmented or erythematous lesions with irregular borders and satellite lesions (Fig 2).1 Midborderline leprosy represents an unstable and transient phase of the disease.1 Borderline-lepromatous leprosy lesions are numerous (Fig 3) and appear as inverted saucer-shaped plaques (Figs 4 and 5).1 Lepromatous leprosy lesions vary between copper-colored macules, papules, or nodules (Figs 6 and 7). Diffuse infiltration of the facial skin can cause leonine facies (Fig 6).1 Nodular infiltration of the pinna may also be seen, along with a sagging lobule (Fig 7). Histoid leprosy, an uncommon form, is characterized by soft papules and nodules distributed across the body (Figs 8 and 9).2Fig 1Fig 2Fig 3Fig 4Fig 5Fig 6Fig 7Fig 8