Ringworm of the armpit hairs is not a bad odor, these are two completely different diseases. Ringworm refers to superficial infection of the armpit hairs due to infection by Clostridium perfringens, which is usually manifested by the appearance of small nodules on the armpit hairs in different colors, such as yellow, black, red, etc. In addition, the armpit hairs may be damaged, brittle and easy to break, and may be accompanied by sweaty and moist underarms and itchy symptoms. Fox odor is a special odor produced by the bacterial decomposition of the secretions of the sweat glands in the armpits, which is usually more pronounced in the summer and after exercise, and in severe cases, the odor may appear even when the person is quiet and not exercising. It is usually accompanied by unusually heavy underarm sweating, which often soaks the underarm clothing. Regardless of the type of disease, it is recommended to standardize the treatment under the guidance of a doctor, pay attention to personal hygiene, bathe and change clothes frequently, and ensure that the underarm area is dry and clean.