The patient’s armpit has a sour smell, may be a normal physiological reaction, may also be caused by abnormal proliferation of hair follicles, as follows: 1, normal physiological reaction: generally very likely to be due to excessive exercise, resulting in the hyperplasia of sweat glands and cause the odor of sweat. This is a relatively common physiological reaction, because the human body in the armpit with more pores and sweat glands, after appropriate exercise, due to the body’s metabolism will be accompanied by sweat breeding and discharge. The relative environment of the armpit is relatively closed, due to the impermeable air, air, will cause the breeding of bacteria, manifested as local odor. Therefore, it is necessary to strengthen the local cleaning and avoid too long time strenuous exercise, reduce the breeding of sweat glands, can improve the local odor. 2, abnormal hyperplasia of sweat glands: some patients due to congenital with axillary odor,, if necessary, can be surgically removed through the abnormal hyperplasia of the sweat glands, to alleviate the symptoms of the local acidic taste. Although this situation has a certain traumatic, but can achieve better results.