Lichen nitidushttps://en.wikipedia.org/wiki/Lichen_nitidus
Lichen nitidus is a inflammatory disease of unknown cause characterized by 1–2 mm, discrete and uniform, shiny, flat-topped, pale flesh-colored or reddish-brown papules. The disease usually affects children and young adults. Generally, lichen nitidus is asymptomatic, therefore, no treatment is required.

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    References Lichen Nitidus 31869173 
    NIH
    Lichen nitidus most commonly presents in children and young adults and does not favor one sex or race. Lichen nitidus presents as multiple, discrete, shiny, flat-topped, pale to skin-colored papules, 1 to 2 mm in diameter. These lesions commonly present on the limbs, abdomen, chest, and penile shaft. It is usually asymptomatic, so treatment is generally for symptomatic or cosmetically disturbing lesions.