If a 7-year-old child has long spots on his face, it may be caused by genetic factors, hyperpigmentation and the use of poor quality cosmetics. 1. Genetic factors: generally freckles, a pigment disorder skin disease, with a certain genetic tendency, the symptoms are usually not obvious in children, but with sun exposure may trigger or aggravate freckles, easy to develop in the nose and cheeks and other exposed parts. 2. Hyperpigmentation: For example, long-term sun exposure or inflammation caused by mosquito bites or burns will stimulate the skin, leading to the formation and deposition of melanin, and ultimately the formation of pigmented spots. 3. Poor-quality cosmetics: some children may use poor-quality adult cosmetics, resulting in spotting on the face and easy allergy. There may be other reasons for 7-year-old children to have spots on their faces, so it is recommended to go to the hospital in time to improve the examination and clarify the cause of the disease, and then give targeted treatment or therapy.