DR HAROUT TANIELIAN / SCIENCE PHOTO LIBRARY DR HAROUT TANIELIAN / SCIENCE PHOTO LIBRARY
Fungal infection of a man's toenail, with hardening and deformity of the nail. Known as onychomycosis, or tinea unguium, this condition can be caused by various fungi which discolour the toenail. In this case, it has been exacerbated by long-term wear from tight-fitting shoes.
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