Methods The clinic,histopathology,immunohistochemistry and ultrastructure of Zygomaticofacial naevus fuscoceruleus, Melasma, Naevus of ota were analysised respectively.

• 方法对颧部褐青色痣、黄褐斑及太田痣的临床、组织病理、免疫组化、超微结构进行分析研究。