Heavy dampness can cause acne on the back, but it is not absolute. Likewise, acne on the back does not necessarily indicate that there is necessarily heavy dampness in the body. There is no necessary connection between the two. If the pimples on the back are caused by heavy dampness, they usually have the following characteristics: pimples that are long-lasting, rising and falling, accompanied by nodules, and have more obvious pustules. The skin is oily, sweaty, more humid and sticky, especially more serious in summer and autumn. Generally can be considered due to the back is wrapped in clothes for a long time, not ventilated, sweat mixed; or drenched in rain and snow, not dried or dried in time; or the surrounding environment is more humid, or heavy fog and dew; or long-term stay in the water work, etc., have increased the possibility of dampness evil cause disease. If the body itself has insufficient spleen qi, transporting water grain and water liquid obstacle, and then over-eating cold, greasy things, so that the body can not be converted into water grain essence, and internal damp heat. It is not possible to determine whether a pimple is caused by heavy dampness just by the pimple on the back. It has to be combined with other symptoms, such as poor appetite, heavy body, dizziness and dizziness, to be considered as arising from heavy dampness. Pimples caused by dampness are more difficult to eliminate and clinical treatment should be patient enough.