The cause of white dead skin inside the nail seam is considered to be related to normal metabolism, localized eczema and fungal infection. 1. Normal metabolism: under normal circumstances, the human body will have a skin metabolism, nail crevice in the case of white dead skin, can not be ruled out due to normal metabolism, if not accompanied by other symptoms, you can choose to temporarily observe, pay attention to hygiene can be. 2. Local eczema: white dead skin inside the nail seam, may be related to local eczema, eczema in the subacute or chronic phase, usually have scabs and flakes, roughness and thickening, moss-like changes, so there may be white dead skin inside the nail seam symptoms. 3. fungal infection: white dead skin inside the nail seam, may also be due to nail fungal disease factors, skin fungi including red ringworm, trichophyton, candida and some molds, etc., after invasion of the nail plate will release a variety of enzymes to break down the nail plate, resulting in cloudy nails, thickening, separating, discoloration, or the presence of white dead skin symptoms. If symptoms are severe, or persist and do not improve, the patient should seek medical attention.