Faint black or brown streaks on nails are often harmless, but scientific evidence shows they may sometimes signal subungual ...

Have you ever taken off your nail polish only to notice a dark line on the nail running vertically down your finger? These ...

When Maria Delgado noticed a dark streak under her big toenail, she assumed it was from dropping her gym bag on her foot. Six months later, that seemingly innocent mark led to a diagnosis that saved ...

Treatment for thick toenails typically includes treating the underlying cause, which can include things like mechanical stress (such as poorly fitting shoes), fungal infection, or an autoimmune ...

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 organisms ...