Children’s skin is getting darker and darker may be caused by prolonged exposure to sunlight, or it may be caused by acanthosis nigricans, skin darkening disease, and so on. 1. Prolonged sun exposure: If children do not pay attention to sun protection when they go out, resulting in prolonged exposure of the skin to ultraviolet rays, then the children may have a darker and darker skin. This is a normal physiological phenomenon, generally do not need treatment, usually pay attention to sunscreen can effectively improve skin color. 2. Acanthosis nigricans: the cause of acanthosis nigricans is still unclear, and it is related to genetic, autoimmune, drug and other factors. Patients will show that the skin color of the neck, armpits and other folds is brownish yellow, gray, and with the increase of melanin in the body, the skin color will gradually become black. In addition, patients will also have symptoms such as dry skin, skin warts and itchy skin. If a child develops acanthosis nigricans, the skin will become darker and darker. 3. Melanosis: Melanosis is a diffuse pigmentation caused by prolonged exposure of the skin to ultraviolet rays, and black or dark brown pigmented spots will appear on the surface of the patient’s skin. It is recommended that children’s skin is getting darker and darker, parents need to take their children to the doctor in time, if it is caused by sun exposure, no need to treat. If it is caused by disease, you need to take appropriate measures for the cause of treatment.