Closed mouth is mainly referred to as closed mouth acne. Cosmetic laser treatments can be used to improve the symptoms of long closed mouth acne, but they do not cure closed mouth acne at its root. Closed mouth acne is a relatively common form of acne, also known as whiteheads, the formation of which is mainly related to the sebaceous gland duct blockage, sebaceous gland duct abnormal keratinization, so that sebum secretion is not able to be discharged out of the body normally, the treatment can be used to improve the function of sebaceous glands through laser treatment to inhibit the secretion of sebaceous glands, so as to achieve the purpose of improving the closed mouth acne. Since there are individual differences in treatment effects, it is recommended that patients consult a doctor in time and choose the appropriate treatment method under the guidance of the doctor.