Mongolian spot and nevus of Ito are located in different sites. There are four types of blue nevus: 1) common; 2) cellular; 3) macular; and 4) atypical. The common blue nevus presents as dome ...

Hirayama and Suzuki [13] examined the histological findings of 450 cases of nevus of Ota and classified the condition according to the distribution of the dermal melanocytes as follows ...