Women have a lot of small bumps on the back, mainly due to the following reasons: 1, hormone levels: generally before and after menstruation hormone levels will change, so before and after menstruation will be more prone to pimples. 2, sebaceous glands secretion: that is, more oil, generally in the chest, back and face are sweat glands distribution of the place, the oil is certainly more, so it is easier to grow small pimples in these parts. 3, Acne vulgaris Bacillus infection: It is also related to daily living habits and dietary habits, such as staying up late, smoking, drinking alcohol, eating spicy and stimulating foods. The treatment of back pimples should change the bad habits, such as reducing late night, and eat less spicy, greasy and sweet food, etc. In addition, back pimples can also be applied externally fusidic acid and erythromycin for anti-inflammatory treatment.