MONDO_0006680 (blue nevus) is an intradermal nevus characterized by the presence of benign pigmented dendritic spindle-shaped melanocytes. It most frequently occurs in the skin of the distal upper extremities, followed by the lower extremities, scalp, face, and buttocks. It usually presents as a single blue or blue-black papular lesion less than 1cm in diameter. Simple excision is usually curative. Also known as: blue Nevus of skin, blue Nevus of the skin, blue skin Nevus.