Fungal nails are contagious, but the infection usually isn’t passed directly from one person to another. Passing on the infection directly requires prolonged physical contact between nails.
An ingrown toenail occurs when a toenail’s sides curve into the soft tissue that surrounds the nail. The tissue around the nail often becomes red, swells and can be painful.
Athlete’s foot can be passed from person-to-person through physical contact. Most people, however, first contract the fungus by walking barefoot on a contaminated surface, such as a locker room floor, swimming pool deck or public shower.