With summer approaching, various types of ringworm will increase. Ringworm is caused by fungi. Fungi prefer warmth and humidity, with an optimum growth temperature of 22°C to 36°C and relative humidity of 95% to 100%. The high incidence of tinea pedis is related to factors such as the sweaty metatarsal area, the absence of sebaceous glands, and the alkaline surface that facilitates fungal growth and reproduction. The genetic predisposition of certain populations to Trichophyton rubrum is also a factor in the development of the disease. Tinea pedis is often a bilateral infection. More than 90% of the causative organisms of tinea pedis are Trichophyton rubrum. Tinea pedis is relatively uncommon in children, but its incidence increases after puberty, with no significant difference in the male to female ratio. There are generally three clinical types: blistering and scaling, hyperkeratotic, and macerated erosions. The lesions of the foot often occur between the third and fourth toes and the fourth and fifth toe seams. Because the skin is thin and tender, in close contact with each other, not breathable, easy to moist, local skin impregnation whitish, rotten skin, uncovered rotten skin to see bright red vesicles or even fissures, with ooze. Sometimes the foul odor and itching are unbearable. Scratching can cause dermatophytosis, which affects the movement of the lower limbs. Tinea pedis is curable. It is usually treated with topical antifungal creams. Topical medications should be applied after washing the feet before going to bed in order to prolong the action of the medication. For hypertrophic hyperkeratotic athlete’s foot can be treated with a topical seal, which is a plastic wrap applied for several hours after topical antifungal cream, once a day. Topical treatment of tinea pedis generally needs to be continuous for 2-4 weeks, otherwise it is very likely to recur. For those who do not do well with topical treatment, oral antifungal drugs such as itraconazole and terbinafine can be taken for 1-2 weeks. The above drugs have mild side effects on liver function, but they should be used with caution in those with a previous history of liver disease, and liver function should be monitored when necessary. There are many factors that affect the efficacy of tinea pedis. The wide distribution of the causative ringworm and the variety of transmission routes determine the long-term nature of the use of antifungal drugs. The most common reason for treatment failure is the short duration of drug use. Preventive measures should be taken along with treatment. Pay attention to personal hygiene, change socks regularly, do not share slippers and bathing equipment with others to avoid cross-infection, and treat ringworm in other members of the family at the same time. Pay attention to the disinfection of shoes and socks. Fungal cell walls contain chitin and/or cellulose and are highly resistant to changes in the external environment. Ultraviolet light cannot kill fungi, so sunlight exposure is ineffective against fungi. However, most fungi can die in a relatively short period of time at about 100°C, so boiling disinfection is both economical and convenient and efficient. Tincture of iodine and peroxyacetic acid can also kill fungi quickly.