Ulcers at the nail-finger junction may be caused by localized fungal infections, vitamin deficiencies, eczema, and onychomycosis. 1. If the body’s immunity continues to decline, and the nail and finger joints are in a moist environment for a long time, fungal infections may occur. Localized itching may occur and ulcerated lesions may form. The use of antifungal drugs such as terbinafine under the guidance of a doctor is needed. 2. Some people due to partiality or picky eating, may lead to some vitamin deficiencies, in this case it is possible to make the nail and finger joint tissue dysplasia, can also lead to repeated ulcers, ulcers and other symptoms. 3. Eczema: is caused by a variety of internal and external factors of the superficial dermis and superficial inflammation, preferably in the hands, feet and other parts of the body, when drinking alcohol, scratching, soap washing, etc. can aggravate the symptoms, affecting sleep. 4. Nail groin infection: it is an inflammation of the tissues around the nails, which is caused by a variety of pathogenic bacterial infections, and the local tissues can be manifested as redness, swelling, heat, pain, and pus can be formed in severe cases. For the case of nail and finger joint ulceration, it is necessary to clarify the cause of the disease in time, and then carry out active treatment.