It is generally advisable to treat a nevus immediately after its discovery. Erythema nevosum is an abnormal disease of the blood vessels of the skin, which is a vascular malformation. It often appears at birth or shortly after birth, and is usually found on the face, neck and scalp, mostly unilaterally. It is recommended to treat the nevus immediately after detection, because the lesions are less in the early stage of detection, and the damage to the skin by laser or other treatments is also less. However, if the patient is too young to cooperate with the treatment, it is recommended that the treatment be done at a later stage, usually around puberty. The longer you delay the treatment, the more damage it will do to the skin, and the lesions will become bigger and thicker as the body grows, and the treatment difficulty will gradually increase with time. It is recommended to go to a regular hospital for treatment after the discovery of nevus, and do not operate blindly to avoid scar formation.