A 15cm hyperpigmented macule on an adolosent male undergoes changes such as coarceness, growth of hair & acne. Diagnosis is ?

Ans. is 'b' i.e., Becker nevus Becker Nevus Usually stas in adolescence as an irregular smooth hyperpigmented macule. Usually involves shoulder, anterior chest and scapular region, although any pa of the may be involved. Slowly grows in size of a palm wile acquiring thick dark hair. Often lesion resembling acne vulgaris in different stages may appear on surface. No treatment is required.