Small bumps on both sides of one’s chin are not normal and may be caused by acne, folliculitis or lichen sclerosus, etc. Medical treatment is recommended when necessary. 1. Acne: It can be related to heredity, androgen-induced sebum secretion, Propionibacterium acnes reproduction, follicular sebaceous gland duct keratinization, etc. It occurs mostly in the skin of young men and women’s cheeks, forehead, chest and back, etc. In the early stage of the lesions, it is whiteheads or blackheads, and after aggravation of the lesions, it can form inflammatory papules, with pustules at the top, and then it can form nodules and cysts. 2. Folliculitis: purulent inflammation of the hair follicle mouth, can occur on the head and face, lesions at the beginning of red papules, then pustules can appear in the center, surrounded by a red halo, pustules can be formed after the breakthrough of the yellow scab. 3. Hair moss: also known as perifollicular keratosis, can occur on the face, upper arms, etc., around the mouth of the hair follicle appeared pinpoint or rice grain size papules, color normal or reddish, sometimes the top of the papules have keratin plugs present gray-brown, chicken skin-like appearance. When more small bumps appear on both sides of the chin, it is recommended to consult a doctor in time and follow the doctor’s instructions for treatment.