As soon as the summer back acne may be summer dermatitis, prickly heat, acne and other diseases, related to climatic factors, sweat is not easy to evaporate, sebaceous gland secretion increased. 1. Summer dermatitis: summer heat, high temperature, high humidity, easy to cause summer dermatitis, resulting in limbs, back and other parts of the large patchy bright red spots, and in the lesions of pimples or mounds of herpes, accompanied by intense itching. 2. Prickly heat: After sweating in summer, the sweat impregnates the skin and makes it swollen, leading to narrowing or blocking of sweat ducts and difficulty in sweat discharge, which can easily lead to prickly heat, resulting in the appearance of raised pimples and pimples on the neck, back and other parts of the body. 3. Acne: Increased sebum secretion in summer clogs pores and forms acne, resulting in pimples on the face, chest, and back, and can be accompanied by enlarged pores and seborrhea. There are other reasons that can cause acne on the back in the summer, it is recommended to go to the hospital in time to find out the cause of the disease, and then follow the doctor’s instructions to standardize the treatment.