Clinical Reference / Clinical Atlas / Acanthosis Nigricans

Acanthosis Nigricans


Fig. 1-1

Widespread acanthosis nigricans. This implies concurrence of an internal malignancy.

Fig. 1-2

Confluent papillomatosis of the lips and buccal mucosa.

Fig. 1-3

Bilateral involvement of the axillae in this obese young man with an endocrine disorder.

Fig. 1-4

The neck is a favorite site.

Individual Lesions

Fig. 1-5

Closely set tiny papules in linear array.

Fig. 1-6

Lesions situated over joints. Note how dark are the fingers in contrast to the rest of the skin.

Fig. 1-7

Pigmented plaque with mammillated surface.

Fig. 1-8

Pigmented, slightly elevated plaque with a gently papillated smooth surface, in this instance punctuated by atrophic striae.

Fig. 1-9

Polypoid excrescences, as well as subtle papules. Grooves that traverse plaques represent accentuation of skin lines.

Fig. 1-10

Ill-defined plaque, thrown into folds, made up of prominent, smooth-surfaced papules, some of them polypoid.

Fig. 1-11

Pigmented plaque in which skin folds are accentuated.

New! Additional Images

Fig. 1-12

Acanthosis nigricans: Brown papules, some of which have become confluent to form a plaque, are intersected by lines normal for skin. The dark brown macule is a Clark’s nevus.