Closed mouth acne appears on the chest due to the accumulation of keratinized material secreted by the hair follicle that cannot be released at the mouth of the follicle, forming dense, pinpoint-sized, evenly distributed small pimples. There is no such thing as the simplest way to eliminate it. You can choose general treatment, medication, physical therapy and other methods to eliminate it. 1. General treatment: first of all, you need to pay attention to do a good job of local skin cleaning and hygiene, it is best to use warm water as well as soap for cleaning, can reduce the local oil adherence, and clogging pores, resulting in aggravation of the condition. 2. Drug treatment: including external drugs and oral drugs. (1) Topical medications: mainly use retinoic acid drugs, such as adapalene gel, tazarotene gel, etc., which can play a role in dissolving acne, and excretion of acne; and secondly, you can also use benzoyl peroxide, which can play a role in killing Propionibacterium acnes as well as dissolving acne. (2) Oral medication: If acne develops into moderate to severe acne with secondary infection, oral antibiotic medication is needed, such as minocycline, doxycycline, etc. Oral isotretinoin can also be used to reduce sebum secretion and control the formation of abnormal keratinization and closed-cell acne. 3. Physical therapy: photodynamic treatment can be used to destroy the propagation of Propionibacterium acnes through photodynamic, thus playing a role in reducing inflammation; acne needles can also be used to squeeze out the contents of the occluded mouth, for the larger suppurative lesions, can be incised for drainage. It is recommended that patients go to the hospital in time and follow the doctor’s instructions for standardized treatment.