Toenail fungus is one of those conditions people whisper about—as if it’s a personal failure instead of an incredibly common, treatable issue. It shows up slowly: a yellow tint, thickening, a change ...

Susan Bard, MD, is a board-certified general and procedural dermatologist with the American Board of Dermatology and a Fellow of the American College of Mohs Surgery.

Thick, yellow, and brittle toenails are often caused by a fungal infection known as onychomycosis. This occurs when yeasts, moulds, or dermatophytes enter small cracks in the nail or surrounding skin, ...

Fungal nail infections, though unsightly, are generally painless and can often be prevented, a skin and nail specialist says. "Fungal nail infections are common and tend to run in families because of ...