Foot Conditions A-Z
Toenail Fungal Infection (Toenail Fungus)
Toenail fungus, also called onychomychosis, usually starts as a white or yellow spot just under the edge of the toenail. As it spreads, it may cause the nail to become discolored, thicken and develop coarse edges. The toenail fungus can be difficult to treat, persist indefinitely and return after it has been cured. While it is not normally dangerous, it can be painful, cause unsightly nails and lead to foot problems such as ingrown toenails for people with diabetes or other conditions that affect blood flow.
Nails infected with toenail fungus also may separate from the nail bed, a condition called onycholysis. This may be accompanied by toe pain and a slightly foul odor.