Nail problems account for about 10 percent of all dermatological conditions. Symptoms that could signal nail disorders include color or shape changes in the nail, swelling of the skin around the nails, thinning or thickening of the nails, bleeding or discharge, and pain.
Fungal infections are responsible for half of all nail disorders. They are more common in toenails since they thrive in the warm, moist environment within shoes.
Other common nail problems include white spots that appear after an injury to the nail, vertical lines of pigment, ingrown toenails, and bacterial infections that most often result from injury, nail biting, finger sucking, or frequent exposure to water.