There are several reasons for the sour smell in the armpits of girls: 1, appear in the summer, is due to the presence of many bacteria on the skin, the hot summer weather body in order to heat will sweat a lot, and more sweat glands in the armpits, due to the physiological structure can not be exposed to the air, resulting in sweat in the armpits to stay too long, so that the armpits in a humid, warm environment, so that bacteria multiply, bacteria and sweat mixed will produce acid Stinky smell. In the cool room to reduce the amount of sweating or sweating, timely scrubbing to clean sweat, can avoid this odor; 2, no matter what season even if not sweating, armpits can smell sour to consider armpit odor, and genetics is related to the role of bacteria and underarm secretions, resulting in unsaturated fatty acids. Light odor daily with warm water to clean the armpits, keep the armpits dry can make the acid smell reduce or disappear, the acid smell serious recommended surgery.