Acne on the back may be due to heavy dampness, but it may also be due to other reasons such as the prevalence of solid heat, wind-drying blood heat, and unhygienic clothing and poor living habits. 1. Dampness is heavy due to the impregnation of the skin surface with dampness, which may lead to the appearance of back skin acne, and may also appear easy to skin oil, eczema, vesicles and other symptoms. 2. Dampness and heat within the full bloom of the heat in, the performance of the outside will appear skin sores canker sores and poisons, so can also appear back acne. 3. wind dry blood heat refers to the internal abundance of blood heat, heat abundance of wind dry, external to the skin, there can be skin erythema, pimples and other manifestations, so it can also be manifested as the back long acne. 4. Other reasons such as daily wear clothes or used sheets are not clean, the use of shower gel is not suitable, often stay up late and so on, may also lead to back skin acne. It is recommended that people with back skin acne should seek medical attention from a professional doctor.