Nevus of Ota in Child
Dermal melanocytoses are caused by an increased number of dermal dendritic melanocytes and can be congenital or acquired. All dermal melanocytoses are more often seen in patients of Asian or African descent, and nevus of Ota, in particular, is more common among females. Nevus of Ota usually occurs in early infancy and early adolescence. It may be present at birth. Unlike the more common congenital dermal melanocytosis (formerly known as a Mongolian spot), it does not spontaneously regress and may darken or grow in size with puberty. These changes are thought to be secondary to UV radiation and hormonal influences. Malignant transformation is very rare. There is an association with ipsilateral glaucoma in 10% of patients with a nevus of Ota later in life.
D22.39 – Melanocytic nevi of other parts of face
254817005 – Nevus of Ota
- Dyspigmentation from alkaptonuria (congenital ochronosis) may have a similar hue, but lack a trigeminal distribution.
- Blue nevus may have similar blue-grey pigmentation but is a smaller well-demarcated macule or papule.
- Lentigo or giant café-au-lait macules impart a tan to brown hue.
- Drug-induced pigmentation can either be diffuse or photodistributed.
- Ecchymoses (see traumatic purpura) will have a history of trauma.
- Arteriovenous malformations can range from blue to red.