What is an ingrown toenail? Ingrown toenails, a condition also known as onychocryptosis, occur when the edge of a toenail cuts into the tissue surrounding it or when the skin around a toe grows over ...

Toenail fungus often starts with mild nail discoloration or lifting. It’s not usually serious, but the nails may thicken, become brittle, or fall off without treatment. Nail fungus (onychomycosis) is ...