Fox odor is a condition in which the armpits and other parts of the body emit an unpleasant odor, which is not harmful to health but brings discomfort to people around. The most common part of the body is the armpit, because the sweat glands in the armpit secrete sweat, which is decomposed by bacteria and produces a volatile and irritating odor, in fact, there are other parts of the sweat glands can also produce similar irritating odor with the armpit, such as some patients in the chest, some patients in the perineum and the perianal area, but clinically referred to as the part of the body that stinks of fox, usually refers to the armpits.