DR HAROUT TANIELIAN / SCIENCE PHOTO LIBRARY DR HAROUT TANIELIAN / SCIENCE PHOTO LIBRARY
Fungal infection of the toenail in a middle-aged woman, with hardening and deformity of the nail. The adjacent skin tissue of the nail is also affected. Known as onychomycosis, or tinea unguium, this condition can be caused by various fungi which discolour the toenail.
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