Patient, female, 16 years old, from Huoqiu County, Lu’an City, Anhui Province, with a black nevus of soybean-like size that has been found on her face for more than 10 years, examination: a black nevus of soybean-like size near the bridge of the nose on the left cheek, with a clear border and no satellite foci. Diagnosis: pigmented nevus (intradermal nevus) Treatment: after signing the consent, pulse carbon dioxide laser treatment. See the picture below.