Dermatosis papulosa nigra describes the presence of multiple, small, 1-5 mm diameter, smooth, firm, black or dark brown papules on face and neck of black-skinned people.
Dermatosis papulosa nigra usually begins in adolescence. The incidence, number and size of lesions increases with age. Lesions occur mainly on the cheeks and forehead but may also be found on the neck, upper back and chest. Scaling, crusting and ulceration do not occur.
The papules are symptomless but may be regarded as unsightly.
The papules of dermatosis papulosa nigra are small seborrhoeic keratoses.
Dermatosis papulosa nigra is likely to be genetically determined with 40-50% of patients having a family history. It is believed to be due to a naevoid developmental defect of the hair follicle.
No tests are needed as dermatosis papulosa nigra is diagnosed clinically. If there is any doubt a skin biopsy can be taken. Histology shows the appearance of a seborrhoeic keratosis with markedly increased pigmentation of the basal layer of the epidermis.
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