Tinea pedis, or ringworm of the foot, is mainly caused by dermatophyte infection. Dermatophytes are often parasitized in the stratum corneum of human skin surface, feeding on keratin, and are a kind of pro-keratin fungi, which can be divided into three categories: Trichophyton, Microsporum and Epidermophyton. 1. Trichophyton: the closest relationship with foot fungus, which is dominated by red trichophyton, accounting for 80% or even more than 90% of the causative agent of foot fungus. In addition to Trichophyton rubrum, Trichophyton rubrum also includes Trichophyton intermedius. As the name suggests, Trichophyton interdigitalis is a trichophyton that exists in the crevice of the toes, so it is the possible causative agent of interdigital foot odor. 2. Microsporidia: dominated by Plaster-like microsporidia, which are extremely rare among the causative agents of foot odor. 3. Epidermolysis bullosa: mainly flocculent epidermolysis bullosa, which accounts for a very small proportion of the causative agents of foot odor. The causative agent of tinea pedis can spread between people, between people and animals, and between pollutants and people. Patients often have the experience of contacting the lesions of tinea pedis patients, or walking barefoot in public bathrooms, swimming pools, gyms, and other public areas, or mixing shoes and socks with patients with tinea pedis before being infected with tinea pedis. It is recommended that patients with athlete’s foot should go to the hospital in time and follow the doctor’s instructions for standardized treatment.