The sides of the nail curve in, pinching the surrounding skin. A pincer toenail causes the skin to become red, tender, and swollen. It also raises the risk of infection. Common causes of pincer ...

Excess moisture. "Fungus thrives in warm, moist environments, so nail fungus can be caused by excessive sweating or walking barefoot in a warm, moist environment like a pool," Weiss says.

White matter and other changes around the toenails and fingernails can occur with psoriasis or nail fungus. However, fungal infections are contagious, and psoriasis is not. The causes and ...

Fungal nail infections are called onychomycosis. Many types of fungi can cause nail infections, but some common types include Trichophyton rubrum and Trichophyton interdigitale. Fungi are ...

One common cause of nail pain is a paronychia ... However, it can affect any toenail. While nails are strong, it’s possible to injure them when something heavy falls on them or when they ...