The patient’s armpit has a sour taste, which may be a normal physiological reaction or may be caused by abnormal hair follicle hyperplasia, as follows: 1. Normal physiological reaction: it is generally likely to be due to excessive exercise after causing sweat gland hyperplasia and causing sweat odor. This belongs to the more common physiological reaction, because the human body in the armpits accompanied by more pores and sweat glands, after appropriate exercise, due to the body’s metabolism will be accompanied by the growth and discharge of sweat. The relative environment of the armpit is relatively closed, due to the lack of air and ventilation, it will cause the growth of bacteria, manifested as a local odor. Therefore, to properly strengthen the local cleaning and avoid too long strenuous exercise to reduce the growth of sweat glands, can improve the local odor. 2, abnormal hyperplasia of hair follicles: some patients due to congenital with axillary odor, which belongs to the local abnormal hyperplasia of hair follicles, if necessary, can be surgically removed abnormal hyperplasia of sweat glands to reduce the local sour taste and other symptoms. This situation is somewhat invasive, but can achieve better results.