Ulcers on fingers may be caused by malnutrition, trauma, eczema or diabetes. 1. Malnutrition: long-term picky eating will lead to the body in a state of severe malnutrition, this situation may affect the regenerative function of the finger skin, resulting in skin ulcers. 2. Trauma: due to the trauma of the finger is not timely treatment of wounds, wounds further inflammation, inflammation is not well controlled, which in turn leads to ulcers on the fingers. 3. Eczema: the superficial dermis and epidermal inflammation caused by a variety of internal and external factors, clinically acute lesions with herpes papules, with a tendency to ooze, severe skin erosion, ulceration, chronic phase to the moss-like changes, easy to recur. 4. diabetes: diabetes will appear in the late peripheral blood vessels of the blood circulation is not good or peripheral nerve damage, which leads to finger wounds appear small breaks after the emergence of difficult to heal the situation and the emergence of ulcers. The cause of finger ulcers, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.