Lichen nitidus is a relatively rare, chronic skin eruption that is characterized clinically by asymptomatic, flat-topped, skin-colored micropapules (see image below). Lichen nitidus mainly affects children and young adults.
The skin is the primary organ system affected. Mucous membranes and nails  also might be involved. Lichen planus can clinically mimic lichen nitidus and can sometimes coexist with lichen nitidus.
The frequency of lichen nitidus is unknown because of its uncommon occurrence. In a study of skin diseases in blacks over a 25-year period, the incidence of lichen nitidus was 0.034%. 
No racial predilection is reported.
No sexual predilection exists. However, generalized variants appear to occur predominantly in females.
Lichen nitidus may affect any age group, but it most commonly develops in childhood or early adulthood.
Lichen nitidus is a benign disease with no associated mortality or complications. Lichen nitidus may remain active for several years; however, spontaneous resolution usually occurs.