Nail Fungus
Nail fungus, also called onychomycosis, affects 50% of all Americans over 40. An infection of nail fungus occurs when fungi infect one or more of your nails. A nail fungus infection may begin as a white or yellow spot under the tip of your fingernail or toenail.
As the nail fungus spreads deeper into your nail, it may cause your nail to discolor, thicken, and develop crumbling edges — an unsightly and potentially painful problem. Nail fungal infections can cause pain and discomfort, and may also lead to serious physical and occupational limitations.