Acne on the back is not entirely caused by mites, but may also be caused by folliculitis, allergic dermatitis, endocrine disorders and other reasons. 1. Mites: mites cause acne on the back is clinically known as mite dermatitis, which is mainly caused by the human scabies mite infecting the skin. It is usually manifested as reddish or normal-colored pimples, papules and other symptoms, which will be accompanied by itching sensation. 2. Folliculitis: Inflammation of hair follicles due to trauma or infection of hair follicles by pathogens such as bacteria, which may manifest as red papules or pustules centered on hair follicles, and may be accompanied by itching and pain. 3. Allergic dermatitis: due to contact with allergens, resulting in allergic dermatitis of the skin, usually manifested as red pimples on the back, accompanied by obvious itching symptoms. 4. Endocrine disorders: Due to the exuberant secretion of androgen, the sebum secretion function is enhanced and more oil is secreted. This leads to the blockage of hair follicles, and the situation of back acne may occur. There are many reasons that lead to back acne, and it is recommended that patients seek timely medical attention to identify the causes. Normally, you should pay attention to local skin cleanliness and hygiene, light diet, do not squeeze the acne.