Moles, also known as pigmented nevi, are usually benign proliferations of melanin. Pigmented nevi are divided into three main categories: junctional nevi, mixed nevi and intradermal nevi. Some of them are misshapen nevi, such as sebaceous nevi. If a mole suddenly grows on the face, we can judge it according to the shape and number of moles. If the mole does not increase continuously and rapidly, and the patient does not experience local pain or itchiness, treatment is usually not needed. If the symptoms tend to worsen, such as the appearance of moles with irregular edges and uneven color, deepening color, expanding range, and satellite foci around, it is recommended to seek medical treatment in time to clarify the cause and then treat. Generally speaking, moles with light color and small range can be treated by chemical peeling or skin grinding; those with dark color or large range can be treated by laser; the removal of nevus of Ota or pigmented nevus can be treated by surgery under the guidance of doctors, and the excised tissues can be examined pathologically to further clarify the nature and determine whether there is a possibility of cancer. In addition, the use of laser or electrocautery to treat nevus cells may lead to the recurrence of residual nevus cells, and repeated attacks or stimulation may cause nevus cells to become malignant, so it is recommended to use it under the guidance of a doctor. Don’t scratch it with your hands or abuse erosive agents to get rid of it in daily life to avoid the appearance of skin lesions causing infection. In addition, we can prevent it by actively protecting ourselves from the sun, increasing the intake of vegetables and fruits, and keeping a relaxed mood.