Black hair nevus is a kind of pigmented nevus, which can be seen as local blackness, rough and raised skin, and long hard short hair. Patients can choose suitable treatment methods under the guidance of doctors according to the size of nevus: 1. Small area: nevus with diameter <0.5cm can choose laser or high-frequency electric knife cauterization, which is simple and convenient to operate, with smaller damage area and smaller healing scar. However, it is difficult to keep the nevus tissue for pathological examination, and it is not easy to remove cleanly, so patients can also choose surgery to remove it; 2. Larger area: If the area of nevus on the face is too large, patients need to choose surgical treatment. Depending on the actual situation of the patient, one or more surgical excisions can be chosen, which can completely remove the mole tissue, but it is more difficult to regenerate the skin after surgery and will leave scarring. The commonly used surgical methods include skin stretching method, skin implant and skin expander implant, etc. Patients should follow the medical advice to choose. A nevus on the face can often affect the appearance of the face and may become cancerous if left untreated for a long time. Therefore, once detected, patients should promptly visit the dermatology department of the hospital and choose the appropriate treatment method according to the situation.