Over the years, there have been fungal infections that affect both the toenail and the fingernails. The fungal infection in the toenail is known as onychomycosis or the toenail fungus, and it is mainly characterized by white, brown, or yellow discoloration of either few or the entire toenails. If the fungal infection is not treated in time, it may cause the nail to crack or thicken. Fungal infections are common to persons that have diabetes, over 65 years in age, have a nail injury, or skin injury near the nail.

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