Nevus is usually referred to as nevus of freckle, which differs from cafe au lait mainly in the cause of disease, clinical symptoms and treatment methods, as follows: 1. Disease etiology: the cause of nevus freckle-like nevus is not known, which may be related to heredity and other factors, usually found at birth or infancy; the cause of cafe au lait is not known, most of them are simple pigmentation changes or one of the early symptoms of serious hereditary diseases such as neurofibromatosis, mottled disease and so on. 2. Clinical symptoms: freckle-like nevus is mainly found in the trunk and limbs of human body, with dark brown patches with clear boundary, smooth surface, no itching, no pain, etc. Cafe au lait spots can involve any parts of the body except palms and metatarsals, and they are mostly found in the face and trunk of human body with varying shapes and sizes, and the color is light or dark brown, with a clear boundary with the surrounding normal skin. 3. Treatment: Freckle-like nevus can be treated by Q laser and other methods. If coffee spot is not serious, it usually does not need to be treated. If it seriously affects the appearance and image, it can be treated by strong pulse light or Q laser, etc. If coffee spot is caused by other diseases, it needs to be actively treated for the original disease. It is recommended that patients with freckle-like nevus or coffee spots should go to regular hospitals in time for diagnosis, and then choose the appropriate treatment plan according to the situation.