Most toe ulcers are caused by a fungal infection called tinea pedis, which is a type of impregnation. Since the fungus likes to grow and multiply in the moist, warm area between the toes, it tends to thicken the epidermal stratum corneum and become white due to moist impregnation when it lives between the toes for a long period of time, and sometimes the feet tend to be sweaty. Removal of the soft, white flakes exposes the erythematous vesicles and even fissures. Tinea pedis usually occurs between the 3rd and 4th toes, but can spread to other toes over time, and is often accompanied by intense itching, and can be foul-smelling when accompanied by bacterial infection. Tinea pedis usually worsens in the summer and decreases in the winter, but it can also persist for years. For treatment and prevention, it is important to keep the area dry and change shoes and socks regularly. When there is exudation, it is usually astringent with powder first, and then antifungal creams such as clotrimazole ointment, miconazole ointment, and terbinafine ointment are used.