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Onychomycosis

Introduction

Onychomycosis is a fungal infection of the toenails or fingernails. Onychomycosis causes fingernails or toenails to thicken, discolor, disfigure, and split. At first, onychomycosis appears to be only a cosmetic concern. Without treatment, however, the toenails can become so thick that they press against the inside of the shoes, causing pressure, irritation, and pain. Fingernail infection may cause psychological, social, or employment-related problems.

Half of all nail disorders are caused by onychomycosis, and it is the most common nail disease in adults. Toenails are much more likely to be infected than fingernails. The incidence of onychomycosis has been increasing and is related to diabetes, a suppressed immune system, and increasing age. Adults are 30 times more likely to have onychomycosis than children. In fact, only 2.6% of children younger than 18 years are reported to have onychomycosis, but as many as 90% of elderly people have onychomycosis.

Onychomycosis is divided into subtypes. The main subtypes of onychomycosis are distal lateral subungual (the area under the nail) onychomycosis (DLSO or DSO), white superficial onychomycosis (WSO), proximal subungual onychomycosis (PSO), endonyx onychomycosis (EO), and candidal onychomycosis. People with onychomycosis may have a combination of these subtypes. Total dystrophic onychomycosis is the term used to refer to the most advanced form of any subtype.



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Onychomycosis

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Psoriasis is a common chronic condition of the skin. A person with psoriasis typically has patches of raised, red skin with silvery scales. The affected skin may look shiny and red or even have pustules, depending on the type of psoriasis the individual has. These skin changes usually occur on the elbows, knees, scalp, and trunk. In the United States, about 7 million people (2%-3% of people) have psoriasis. About 150,000-260,000 new cases are diagnosed each year. Psoriasis can also affect the fingernails and toenails, causing pitting and thickening and irregular contour of the nail.

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Onychomycosis »

Onychomycosis (OM) refers to a fungal infection that affects the toenails or the fingernails.

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