Lichen nitidus https://en.wikipedia.org/wiki/Lichen_nitidus
Lichen nitidus est morbus inflammationis ignotae causae, papulae 1‑2 mm propriae, discretæ et uniformæ, nitidæ, planæ, calvæ, pallide carneo‑coloratis vel rubro‑brunneis. Morbus plerumque afficit infantes et iuvenes adultos. Fere autem asymptomaticus est, itaque nulla curatio necessaria est.

Informationes plurimae ― Latine
References Lichen Nitidus 31869173 
NIH
Lichen nitidus typicus in adolescentibus et iuvenibus adultis apparet, utrumque sexum et omnes gentes aequaliter afficiens. Ostendit parvas, lucidas, planas papulas in cute, plerumque 1‑2 mm latas. Haec papulae saepe apparent in brachiis, cruribus, ventre, pectore, vel in regione genitali. Saepe asymptomatica est; igitur tractatio symptomatica vel cosmetica laesiones solent perturbare.
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.