Possible causes of rotten toes include tinea pedis, malnutrition, etc. Treatment can be given to address the cause. Tinea pedis is the most common cause of skin ulcers on toes, related to local fungal infections, often manifested as blisters, maceration, keratinization, desquamation or erosion and other symptoms of rotting toes, mostly itching symptoms, ulceration of severe cases may have bleeding and pain. Treatment with topical antifungal cream such as terbinafine cream, serious cases can also take oral antifungal drugs such as itraconazole capsules. Foot malnutrition can also cause toe skin ulceration, manifested as rotten toes, treatment needs to be given targeted nutritional supplements, such as supplemental vitamins, proteins and so on. All of the above drugs should be used in accordance with the doctor’s instructions. There may be other reasons for the foot skin ulcers, you should consult a doctor in a timely manner, under the guidance of the doctor standardized treatment, so as not to delay the condition, resulting in adverse consequences.