It mostly occurs on the face, neck and back, and can exist at birth or gradually appear in the first few years after birth. Most of them grow slowly or remain unchanged for many years, but spontaneous degradation rarely occurs. Pigmented nevus is common, and the average number of normal individuals is 15~20. Most of them are small, or punctate, or the size of rice grains, usually less than 0.5cm, and the surface of moles is smooth. Or hypertrophy, or rough warty, papillary or pedicled nodules. Moreover, it is common to have long black or black and white hair, which looks like hair, so it is called hair mole. The length of hair stays at a certain limit and does not have the characteristics of continuous growth of hair. According to the distribution of nevus cells in skin tissue, it can be basically divided into borderline nevus, mixed nevus and intradermal nevus. From your description, intradermal nevus: it is a pigmented nevus common in adults, with flat skin lesions or high skin surface, brown to dark color and long hair; No vitality, no evil change. Treatment: According to your description, surgical resection is recommended. I am well aware of your concern: scar problem: usually when we remove a tumor, we follow the skin texture and hide it in the outline of tissues and organs. We also reduce the tension of the incision when sewing. This can ensure that the scar is not obvious. Judging from your situation, the mole is close to the person, and the structure of the person must not be destroyed during the operation, and the scar will be hidden in the midline of the person. In addition, you are a mole with a length of 4mm, and the spindle will only be extended by about 2mm after cutting. So you don't have to worry about appearance. For the specific preparation before and after the operation, you can see the introduction of moles in my plastic surgery medical guide!