Moles are limited skin pigmentation abnormalities that can be present at birth or can occur later in life. Most of these moles are benign and do not require treatment. However, some moles grow on the face and affect the appearance, so different methods can be used to remove them. The following methods are commonly used to remove moles: laser method, freezing method, electrocautery method, mole removal by spot sweeper and chemical removal method. Black hair nevus is a type of nevus, which often attracts special attention because of its local blackness, rough and raised skin, and long hard short hair. For moles that occur in areas of the body that are prone to friction or injury, we should pay attention to them, such as rapid growth and enlargement of the mole, lightening or deepening of the color, loss of short hairs on the mole, redness around the mole, faintly visible blood, broken crust on the surface or even the formation of a long-lasting ulcer. The enlargement of nearby lymph nodes or the appearance of some small satellite-like moles around a large mole indicate that the mole has the tendency of malignant transformation and should be diagnosed in hospital for timely treatment. For the treatment of nevus, small moles with a diameter of 0.5 cm or less can be treated with laser or high-frequency electric knife cautery. The advantages are easy operation, less damage to normal tissues, and small scars after treatment; the disadvantage is that it is difficult to keep the nevus for pathological examination, and it is not easy to get rid of it. Also, freezing and chemical erosion are not suitable for mole removal because of the legacy of unclean removal and stimulation of malignant transformation of mole cells. The above-mentioned shortcomings can be remedied by using ring drill to remove the nevus. With a ring drill that is 0.2 cm larger than the diameter of the mole, the entire mole is drilled under local anesthesia, and the incision is closed with only one stitch with a very fine silk suture.