There are many causes of recurring red pimples around the mouth, such as acne, folliculitis and contact dermatitis. 1. Acne: It is related to factors such as exuberant secretion of androgen in the body, increased secretion of sebaceous glands in the hair follicles, overgrowth of keratinocytes around the hair follicles, and infection by Acinetobacter spp. It may cause recurrent pimples, pimples, pustules, nodules, etc. around the mouth. 2. Folliculitis: an inflammatory disease of the hair follicles and their surrounding tissues often caused by bacterial or fungal infections, especially in patients with low immunity or diabetes mellitus, which may cause recurrent inflammatory papules and pustules around the mouth. 3. Contact dermatitis: often caused by contact with allergens, common allergens such as cosmetics, detergents, food, etc., can lead to recurrent erythema, papules, pimples, etc., around the mouth, and can be accompanied by varying degrees of itching. There may be other reasons for the recurring red pimples around the mouth, so it is recommended that the patient go to the hospital in time to clarify the cause of the disease and follow the doctor’s instructions to standardize the treatment.