Pigmented nevus surgery is actually very safe because pigmented nevus is a swelling caused by melanin cells on the body surface, which is benign and generally superficial, so the surgical operation is relatively simple and safe. Pigmented nevus can be big or small, commonly facial nevus is small, scattered and single, simple excision under local anesthesia can achieve effective treatment. There are other types of nevus in clinic, the less common ones are huge nevus and nevus with hair growing on it. The scope may be very large, the largest one has seen a nevus with the whole trunk and even half of the limbs, this kind of nevus is more complicated to deal with, need to be done under general anesthesia, and even need to be repaired several times. This kind of patient repair surgery is more difficult, the main risk is blood loss during the operation, experienced doctors can grasp the rhythm of this operation very well, the blood loss can be controlled very well, this kind of surgery is also very safe, in short, this kind of surgery is relatively safe, basically no accidents happen.