Dermatosis Papulosa Nigra Clinical Presentation

Updated: Aug 07, 2017
  • Author: Mehran Nowfar-Rad, MD; Chief Editor: Dirk M Elston, MD  more...
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Presentation

History

Lesions usually begin during puberty. They tend to increase steadily in number and size as the individual ages.

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Physical Examination

Dermatosis papulosa nigra is characterized by multiple, firm, smooth, dark brown to black, flattened papules that measure 1-5 mm in diameter. Lesions occur mainly on the malar area of the face and the forehead, although they also may be found on the neck, upper back, and chest. A small percentage of patients have similar lesions on the upper trunk. Scaling, crusting, and ulceration do not occur.

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Causes

Dermatosis papulosa nigra is likely to be genetically determined, with 40-54% of patients having a family history of involvement. Dermatosis papulosa nigra is believed to be caused by a nevoid developmental defect of the pilosebaceous follicle. Hairston et al have suggested that dermatosis papulosa nigra should be classified within the group of epithelial nevi. [4]

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