Also found in: Dictionary, Thesaurus, Medical, Wikipedia.


A fungus disease of the nails.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a disease of the nails caused by pathogenic fungi (seeDERMATOMYCOSES). Onychomycosis usually accompanies epidermophytosis; less commonly, trichophytosis, favus, candidiasis, and other fungal diseases. Onychomycosis, which rarely occurs as a separate disease, can arise in combination with fungal diseases of the skin and hair.

Acute inflammation is usually absent in onychomycosis. The nail plate becomes yellow, opaque, or brown, as well as brittle and thick: the nail often separates from the bed and becomes deformed. In some forms of onychomycosis, for example, when the accompanying disease is an epidermophytosis, all the nail plates are affected. In other forms, only a few nail plates are affected; for example, when trichophytosis is the accompanying disease, only the nails of the first and fifth toes have lesions. The pathological process may sometimes spread from the surrounding tissues to the nail plate. This occurs, for example, in onychomycosis that results from candidiasis, when the infection spreads from the borders of the nail.

Onychomycosis is treated by removing the nail plates with keratolytic plasters or with surgery and by applying antifungal agents. The disease is prevented by protecting the nail plates against injuries, treating microtraumas of the skin and nails with a 2 percent tincture of iodine, and by wearing shoes that fit properly. It is also important to control perspiration, to take proper hygienic care of the nails, and to wear slippers in baths, pools, and showers. On the public level, onychomycosis is prevented by disinfecting the patient’s personal belongings, by preventive checkups, and by inspection of public baths, pools, barbershops, and therapeutic baths. Cattle and other domestic animals are inspected for onychomycosis.


Sheklakov, N. D., and M. V. Milich. Gribkovye zabolevaniia cheloveka. Moscow, 1970.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Because onychomycosis is misdiagnosed so often, objective laboratory evidence is needed to confirm the diagnosis.
Onychomycosis, a common adult malady, is not a common cause of pediatric onychodystrophy, so providers should cast a broader diagnostic net, according to Dr.
The population of this study included subjects with onychomycosis with different ages and both sexes, the epidemiological characteristics of the patients were recorded and informed consent was obtained.
If you think you have onychomycosis, it is important to see a dermatologist to be evaluated so other diseases can be ruled out and it can be treated effectively.
In a Phase III clinical study conducted by Sato Pharmaceutical of NAILIN Capsules 100mg administered orally once daily for 12 weeks in patients with onychomycosis conducted in Japan, superior efficacy was confirmed for NAILIN Capsules 100mg compared to placebo.
Keywords: Toenail onychomycosis, venous insufficiency, Doppler ultrasonography.
PAS staining is found to be more sensitive (80.3%) for diagnosis of onychomycosis as compared to KOH (29.4%) (p=0.02).
Given variations in practice and effectiveness of confirmatory testing, previous research has questioned the role of confirmatory testing for management of onychomycosis [8-11].
In the mycological field, several studies have demonstrated that SEM is a good method for observing fungal ultrastructure in nails with onychomycosis [5-9].
Although all papers reviewed onychomycosis in adults, selection criteria showed variation.