DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Deformed toenails (onychogryphosis) on the foot of a 90 year old woman. The cause of this thickening, hardening and overgrowth of the nails is unknown, although it is associated with self-neglect. It may be related to fungal infections or poor blood circulation.
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