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The congenital melanocytic nevus is a type of melanocytic nevus (or mole) found in infants at birth. This type of birthmark occurs in an estimated 1% of infants worldwide; it is located in the area of the head and neck 15% of the time. ==Classification== Congenital melanocytic nevi may be divided into the following types: * ''Small-sized congenital nevocytic nevus'' is defined as having a diameter less than 2 cm.〔 * ''Medium-sized congenital nevocytic nevus'' is defined as having a diameter more than 2 cm but less than 20 cm.〔 * ''Giant congenital melanocytic nevus'' (also known as "Bathing trunk nevus," "Garment nevus," "Giant hairy nevus", and "Nevus pigmentosus et pilosus") is defined by one or more large, darkly pigmented and sometimes hairy patches.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Congenital melanocytic nevus」の詳細全文を読む スポンサード リンク
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