<unk>  (also known as "congenital melanosis bulbi",<unk>  fuscoceruleus ophthalmomaxillaris", "oculodermal melanocytosis",:700 and "Oculomucodermal melanocytosis") is a blue hyperpigmentation that occurs on the face. It was first reported by Dr. M. T.<unk>  of Japan in 1939.<unk>  is caused by the entrapment of melanocytes in the upper third of the dermis. It is found on the face unilaterally 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.[full citation needed]<unk>  may not be congenital, and may appear during puberty.
Nevus of Ota
Halo nevus
Eccrine nevus
Xanthelasma
Rhinoscleroma
Enamel pearl
Pilomatricoma
Blepharophimosis