This is a fungal infection. Fungi parasitize under the dermis, destroying the integrity of the skin, often causing itching and blisters, and in severe cases, cracks and especially pain. It is usually difficult to recover completely and is more likely to relapse, resulting in delayed recovery. Soak the affected area in hot water every night to make it soft, and then apply Myoshengyuhong ointment and miconazole nitrate cream. This method is suitable for chapped skin. For those with localized inflammation and blisters, you can use compound Hibiscus bark tincture to apply it twice a day for one month, and it can generally be cured. Avoid using footbaths and slippers with ankles or vagina to avoid mutual infection.