Redness and ulceration between the fingers are often seen in impregnated dermatitis, fungal infection or eczema, which should be analyzed according to the symptoms. 1. Impregnated dermatitis: sweating between the fingers, contact with liquids, moisture, corrosion, surface breakage will lead to the emergence of impregnated dermatitis, so that redness and ulceration between the fingers. 2. Fungal infection: redness and ulceration between the fingers can also be seen in fungal infection caused by ringworm. This cause is usually related to the body’s immune system, but also the abuse of antibiotics, long-term hands soaked in water, often in the hot, humid environment can also be caused. 3. Eczema: the occurrence of this disease can be induced or aggravated by food, inhalants, living environment (such as hot, dry, etc.), animal fur, a variety of chemicals (such as cosmetics, soap, synthetic fibers, etc.). It causes eczema on the hands, followed by redness and ulceration between the fingers. Redness and ulceration between two fingers may also have other causes, and it is important to go to the hospital as soon as possible to avoid aggravation of the condition.