There is a nevus on the neck below the right ear without special significance, which is considered to be benign neoplastic disease, such as nevus cell nevus, seborrheic keratosis or capillary malformation, but we should also be alert to the occurrence of malignant tumors. 1. Nevus: also known as pigmented nevus, it is a benign skin tumor of melanocyte origin, it can occur in any part of the body, the skin lesions are flat or elevated maculopapular or patchy rash with smooth surface, it can be divided into nevus junctionalis, nevus compositeis and nevus dermatomatosus. 2. Seborrheic keratosis: also known as senile warts, the most common benign epidermal proliferative tumors in the elderly, skin lesions are 1 or several light brown flat papules or plaques. 3. Capillary malformation: also known as nevus erythematosus, which can exist at birth and is commonly found on the face and neck, the lesions can gradually become darker with age and can be higher than the surface of the skin, forming nodular lesions. When the pigment of nevus deepens, becomes bigger, or there is pain or itching, it is necessary to be alert to the possibility of malignant transformation, such as the appearance of melanoma. It is recommended to consult a doctor in time when you find any abnormality in a mole, so that it can be treated in a targeted way.