<unk>  is caused by the entrapment of melanocytes in the upper third of the dermis. It is found only on the face, most commonly unilaterally, rarely bilaterally and involves the first two branches of the trigeminal nerve. The sclera is involved in two-thirds of cases (causing an increased risk of glaucoma). It should not be confused with Mongolian spot, which is a birthmark caused by entrapment of melanocytes in the dermis but is located in the lumbosacral region. Women are nearly five times more likely to be affected than men, and it is rare among Caucasian people.<unk>  may not be congenital, and may appear during puberty.
Nevus of Ota
Halo nevus
Adenoma sebaceum
Onychomatricoma
Eccrine nevus
Eruptive vellus hair cyst
Trichofolliculoma
Woolly hair nevus