Closed mouth acne on the chin can be treated with acne needles, medication or fruit acids. 1. Acupuncture: With the help of an experienced healthcare professional, a sterile acne needle can be used to open the follicular opening of a closed mouth acne, and then gently squeezed to expel the stagnant keratin and sebum inside. 2. Take medication: Patients can use medication that can promote the normalization of follicular keratinization, such as topical retinoids, such as adapalene, to help clear acne. Oral isotretinoin can also be taken to inhibit the follicle sebaceous gland duct keratinization, reduce sebum secretion, thereby reducing the formation of keratosis pilaris. 3. Fruit acid treatment: you can use a high concentration of fruit acid on the skin’s stratum corneum to shed, so that the cells of the stratum corneum to accelerate the renewal, can improve the skin acne problem. The situation of chin long closed mouth acne should go to the hospital in a timely manner, under the guidance of the doctor to choose the appropriate treatment, avoid self-medication, so as not to aggravate the condition.