Toe ulcers may be related to diabetes, tinea pedis, eczema and so on. 1. Diabetes: due to blood sugar is not well controlled for a long time. High sugar can damage the nerves and blood vessels in the feet, which can cause the toes will be ulcerated. If the ulcers are not treated in time or heal well, they may cause gangrene. 2. Tinea pedis: due to fungal infection, commonly known as foot fungus. When macerated erosion type occurs, it is manifested as whitening and ulceration of toe seams. When the area is large, toe ulceration may occur, accompanied by localized pain and infection. 3. Eczema: common in acute eczema. In severe cases, blisters appear, merge into pieces, and ulceration and erosion appear, manifested as toe erosion. When toe ulceration occurs, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment or therapy.