Fungal nail infection occurs when a fungus grows in and around your fingernail or toenail.
Fungi can live on the dead tissues of the hair, nails, and outer skin layers.
Common fungal infections include:
Fungal nail infections are most often seen in adults. They often follow fungal infection of the feet. Infections occur more often in toenails than in fingernails.
People who often go to public swimming pools, gyms, or shower rooms, and people who sweat a lot often have these infections. The fungi that cause them live in warm, moist areas.
You are at higher risk of getting a fungal nail infection if you:
Symptoms include nail changes on one or more nails (usually toenails) such as:
Your health care provider will look at your nails to determine if you have a fungal infection.
The diagnosis can be confirmed by looking at scrapings from the nail under a microscope. This can help determine the type of fungus. Samples can also be sent to a lab for a culture. (Results may take up to 3 weeks.)
Over-the-counter creams and ointments generally do not help treat this condition.
Prescription antifungal medicines that you take by mouth may help clear the fungus.
Laser treatments may be able to get rid of the fungus in the nails.
In some cases, you may need to have the nail removed.
The fungal nail infection is cured by the growth of new, non-infected nails. Nails grow slowly. Even if treatment is successful, it may take up to a year for a new clear nail to grow.
Fungal nail infections may be hard to treat. Medicines clear up fungus in about half of patients.
Even when treatment works the fungus may return.
Call your health care provider if:
Good general health and hygiene help prevent fungal infections.
Nails - fungal infection; Onychomycosis; Infection - fungal - nails; Tinea unguium
Habif TP, ed. Clinical Dermatology. 5th ed. Philadelphia, Pa: Saunders Elsevier; 2009:chap 25.
Hay RJ. Dermatophytosis and other superficial mycoses. In: Mandell GL, Bennett JE, Dolin R, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Churchill Livingstone Elsevier;2009:chap 267.
Updated by: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.
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