First, the concept of tinea pedis (commonly known as foot fungus) is a common skin disease caused by fungal infection. It is often aggravated in summer and alleviated in winter. It is relatively rare in children, and the incidence increases after puberty, with no significant difference in the proportion of men and women. Second, the etiology of this disease is caused by fungi (causative agent of more than 90% for red trichophyton, followed by flocculent epidermolysis bullosa, trichophyton fungus, etc.). The disease can be triggered by sweaty and moist feet or unventilated shoes and socks. The dermatophytes are often infected through contaminated bathhouses, swimming pool floors, bath towels, common slippers, and foot wash basins. The disease can be divided into three types according to the performance of skin lesions: 1, blister type between the toes, soles, side of the foot occurs between the pinhead to mung bean large deep in the blisters, blister wall shiny, thick, clear content, not easy to rupture, blisters fusion into multi-compartmental blisters, tearing off the wall of the blisters can be exposed to honeycomb-like base and bright red vesicles, can be secondary to bacterial infections. The blisters dry on their own and form white dotted and ring-shaped scales. There are different degrees of inflammation and itching. 2.Hyperkeratotic type is flaky erythema, accompanied by diffuse thickening of keratin, roughness, desquamation, the surface is covered with scales, the edge is still clear, the center texture is more obvious, and there is a roughness when touching. Deeper fissures and scales are formed on the heel, with painful bleeding. It can develop to the dorsum of the foot and form patches with scales. 3.Impregnated erosion type is also known as inter-abrasion type. The skin between the toes is impregnated with whitish, the base is moist and red, and the vesicles ooze, which is similar to the interphalangeal vesicles caused by Candida. Lesions of the foot often occur between the third and fourth toes and the fourth and fifth toe crevices. Because the skin in this place is thin and tender, in close contact with each other, impermeable and easily moist, the local skin is impregnated with whitish, in the form of putrefactive skin, and the putrefactive skin is uncovered to see bright red erosion surface or even fissure, accompanied by oozing, and then bacterial infection, pus, and the formation of ulcers. Sometimes it emits a foul odor and itches unbearably. Diagnosis The diagnosis of this disease is relatively easy, according to the above clinical manifestations and fungal microscopy or culture can determine the diagnosis. V. Treatment For mild cases, topical medication is generally used. Blister type and hyperkeratotic foot odor can be treated with antifungal ointment, the treatment cycle must be long, adhere to one month to two months, can prevent its recurrence. The impregnated vesicular type can only be treated with the above methods after the vesicles are dried first. The more serious cases can be treated with external and internal medication, specific internal medication can go to the local regular hospital dermatology treatment. Prevention: Wear ventilated and breathable cotton socks, and change and clean them every day. 2. Avoid wearing non-breathable sneakers, it is best to have two pairs of shoes to wear, sandals are the best choice. 3. Do not share shoes, slippers and socks with others. 4. Don’t scratch the itchy soles of the feet or between the toes to prevent the infection from spreading to the fingers. 5. Do not stop taking the medicine automatically, usually after you feel better, continue to take the medicine for several weeks, and it is best to do fungal examination and culture, and only when it is negative for three consecutive weeks will it be considered as cured.