If there is a black mole since childhood, it is considered to be a congenital nevus of pigmentation, which usually does not need to be removed, and can be surgically removed if it is in the area that is easy to rub, or affects the aesthetics, or has a tendency to malignant transformation. Congenital nevus is a benign skin tumor of melanocyte origin, which can occur in any part of the skin. 1. If it does not need to be removed: if it does not occur in the parts that are easy to rub, does not affect the aesthetics, and has no change, it does not need to be treated, pay attention to the hygiene, and observe it more often. 2. Circumstances that need to be removed: If the nevus occurs in palmoplantar, waist, armpit, groin and shoulder, etc., and is easy to rub or hurt, or affects the aesthetics, surgical excision can be considered, and if there is a tendency of malignant transformation, it should be excised as early as possible, and at the same time, a histopathological examination should be carried out. It is recommended to go to the regular hospital first after the interview to standardize the diagnosis and treatment, so as not to delay the condition.