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Slide show
Slide show: How to trim thickened toenails
By Mayo Clinic staff
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Thickened toenails: What causes them?
Your toenails can thicken for many reasons. These include an injury; skin conditions, such as psoriasis; tight or poorly fitting shoes; and fungal infections — as shown in this picture.
Among these, a fungal nail infection — onychomycosis (on-i-ko-mi-KO-sis) — is the most common cause of thickened toenails.
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