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What is Dermatosis papulosa nigra and explain in detail?
Dermatosis papulosa nigra (DPN) is a condition of many small, benign skin lesions on the face, a condition generally presenting on dark-skinned individuals.: 638–9  DPN is extremely common, affecting up to 30% of Black people in the US. From a histological perspective, DPN resembles seborrheic keratoses. The condition may be cosmetically undesirable to some.
They should not be confused for Leser-Trélat sign, a sudden explosion of lesions due to a growing tumor.

Pathophysiology
The pathophysiology of DPN is unknown. Evidence of family history may suggest a genetic propensity.

Treatment
DPN lesions are benign and no treatment generally is indicated unless lesions are cosmetically undesirable. Surgical options including curettage, cryotherapy and laser therapy are options