Acne on the face of a 13-year-old child is also known as acne is generally due to poor lifestyle and dietary habits, sebaceous gland secretion, abnormal keratinization of hair follicle openings and other factors, and can be treated by regulating the diet, improving lifestyle habits, medication, physical therapy and other ways. 1. Dietary regulation: If the child likes to eat spicy and stimulating food, high salt and sugar, it may aggravate acne, so the diet should be light, less spicy and stimulating food, and more green vegetables. 2. Improve lifestyle habits: If your child has recently been under stress, used to stay up late, etc., which can lead to increased oil secretion and aggravate acne, it is recommended that your child adjust his work routine to avoid excessive stress, reduce the number of late nights, and usually use some mild cleanser to wash his face. 3. Medication: If the acne is not serious, you can use Vitamin A cream, benzoyl peroxide gel and so on to smear the affected area. If the symptoms are more serious, systematic treatment should be carried out, such as oral doxycycline, isotretinoin, prednisone, anti-androgen drugs (spironolactone) and so on. 4. Physical therapy: If the child is mild or moderate lesions can be treated with LED blue light or red light. Parents are advised to take their children to the hospital for medical treatment if their children have acne on their face, and the drugs should be used under the guidance of a doctor.