There are many reasons for acne around the mouth, such as clogged pores, endocrine disorders, dietary factors, ringworm and so on. 1. Pore clogging: many sebaceous glands are distributed around the mouth, and sebaceous glands secrete too much oil and do not pay attention to skin care, which may lead to the hair follicles around the mouth to be clogged, thus causing a circle of the mouth with pimples. 2. Endocrine disorders: irregular work and rest, irregular diet, mental stress and other factors may lead to endocrine disorders, resulting in a circle of mouth acne. 3. Dietary factors: daily like to eat greasy, spicy, spicy, fried and other stimulating food, may also lead to a circle of mouth acne. 4. Ringworm: ringworm will show a ring of mouth appear red spots, pustules, red nodules and other phenomena, also accompanied by flaking, itching, etc., mainly due to fungal infection, need to carry out fungal microscopy or fungal culture diagnosis. There are many reasons for acne around the mouth, it is recommended that the patient can go to the hospital to improve the examination, clear diagnosis, after diagnosis, follow the doctor’s instructions to take standardized, targeted treatment.