The most important thing is that you can get the most out of your nail. This can lead to low self-esteem and social impairment. In addition, it may also affect the fine movements and functions of the hands or feet, leading to a restricted normal life and work; 2. Infection: Grey nails are highly contagious, and family members and friends can be infected by contact. The nail may also spread the fungus to other parts of the body, leading to ringworm, ringworm, and ringworm. 3. Complications: In patients with severe gray nails, the affected fingers are prone to secondary bacterial infections, leading to complications such as onychomycosis and onychomycosis, and even causing dermatitis and cellulitis, resulting in redness, swelling, pus, and severe pain in the affected area.