Tinea pedis is a common inflammatory skin reaction caused by fungal infections in clinical practice. Dacrynic acid can be used to treat tinea pedis, as it is a commonly used azole antifungal drug. However, the patient must pay attention to the appearance of foot fungus may be the first local ooze, or skin ulcers as the performance of the case, for this situation is generally not recommended to directly apply Dakin to the external application. It is recommended that patients apply boric acid solution or isacridine lactate solution for wet compresses, and then apply miconazole powder to the local area when the exudation is relatively small, to play a good antifungal effect. When the local healing is better, then apply drugs such as Dacronin for external application.