Gray nail is a fungal infection disease, although the initial manifestation of the nail side edge only irregular small white spots, and then become lusterless gray spots, but the disease process is long, the human body is more harmful, common hazards are as follows: 1, affect the aesthetic: nail thickening, brittle, up layer, bad broken, buckling, nail decay in the middle layer, nail edge uneven, nail plate and nail bed separation, so that the nail plate is defective, seriously affect the aesthetic, and even The nail is a very important part of the body’s physiology, and if the nail is severe, it may be insensitive when touching objects, affecting fine movements and functions; and when the nail is severe, it can cause pain, which can affect daily activities and work; 3. The nail is contagious, family and friends can be infected by close contact. If your nails or toenails scratch other parts of the body, they may infect your body with fungi and cause fungal infections in other areas, such as ringworm, ringworm, ringworm, etc.; 4. Complications: Patients with long-standing gray nails have exposed muscles within the nail or are squeezed by thickened nails, and once they are subjected to various traumas, they are prone to secondary bacterial infections, which can lead to complications such as onychomycosis, onychomycosis, and even to dermatitis, cellulitis This can lead to complications such as nail fungus, nail bed infection, and even to dermatitis and cellulitis.