Fox odor is not a fungal infection, it is caused by bacterial infection, heredity, diet and so on. 1. Bacterial infection: in summer when it is hot, tense, strenuous exercise, the secretion of underarm sweat glands will produce short-chain fatty acids and ammonia under the action of local bacteria, especially diphtheria-like bacillus, and the odor will appear. 2. Heredity: this disease has a certain degree of heredity, parents, brothers, sisters in the number of people suffering from fox odor, the higher the possibility of being inherited. 3. Diet: After consuming foods with irritating odor such as garlic or raw onion, you may excrete sweat with foul odor, which leads to bad breath. It is recommended that patients who suffer from bad breath go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying their condition.