Onychomycosis

Onychomycosis, also known as tinea unguium, is a fungal infection of the nail. Symptoms may include white or yellow nail discoloration, thickening of the nail, and separation of the nail from the nail bed. Fingernails may be affected, but it is more common for toenails.

Complications may include cellulitis of the lower leg.
A number of different types of fungus can cause onychomycosis, including dermatophytes and Fusarium.
Risk factors include athlete's foot, other nail diseases, exposure to someone with the condition, peripheral vascular disease, and poor immune function.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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