Closed mouth generally refers to whiteheads, which are usually caused by increased sebum production in adolescent children. It can be relieved by general treatment such as strengthening cleansing, taking medication as prescribed by the doctor, and laser treatment. 1. General treatment: It is recommended that adolescent children pay attention to the cleanliness of the skin. Keeping the face clean will help reduce the likelihood of closed mouth acne. Adolescents should also avoid staying up late, maintain good habits, and eat a light diet to prevent sebum secretion from increasing due to endocrine disruption. 2. Medication: If your adolescent’s acne is more serious, take retinoids, such as isotretinoin, under your doctor’s supervision, to effectively relieve acne and prevent it from progressing into acne. In addition, you can also follow the doctor’s instructions for external application of drugs, such as clotrimazole ointment. 3. Laser treatment: Adolescent children can go to regular hospitals for light laser treatment, which can achieve the purpose of removing the closed mouth, and usually does not leave obvious scars. All in all, adolescent children can choose the appropriate treatment according to the severity of closed mouth. In addition, care should be taken to avoid scratching and squeezing the closed mouth to avoid inflammation. All of the above medications should be used under medical supervision.