Different types of onychomatous nevus, surgical removal has different effects on aesthetics: 1, the width of onychomatous nevus is very narrow, a thin line, the surgery has little effect on the appearance of the nails; 2, the width of the black spot reaches 1/4-1/3 of the nail, surgery to remove part of the onychomatous nevus, the width of the nails is narrowed, there is no nail in the front of the position of the onychomatous nevus to be excised, and there is a gap in the middle of the next two pieces of nails; 3, the onychomatous nevus has involved the whole nail, the complete excision of the onychomatous nevus is done through implantation of the wound to cover the surface of the wound, the nails won’t grow back, and the position of the nails are replaced by the skin after they have healed well.