melanocytic nevus blue nevus MEDGEN:104930 Tièche-Jadassohn nevus Jadassohn-Tièche syndrome UMLS:C0206736 ICDO:8780/0 NCIT:C3803 blue Nevus of skin blue skin Nevus blue neuronevus blue nevus Jadassohn-Tièche nevus Jadassohn-TiC(che syndrome EFO:1000841 Jadassohn-TiC(che nevus MONDO:0006680 MedDRA:10062788 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. MESH:D018329 blue Nevus of the skin SCTID:254806009 benign mesenchymal melanoma