This image displays onycholysis, which means lifting of the nail from the nail bed. As displayed in this image, in onycholysis, the nail is lifted from the nail bed and appears white or yellow. Onycholysis has many causes, including psoriasis, fungal nail infection, or a reaction to a medication. This image displays onycholysis (lifting of the nail) caused by psoriasis. This image displays onycholysis caused by medication. This image displays nails that have separated from the nail bed, caused by onycholysis. Onychomycosis often affects only the great toenail and may show separation of the plate from the nail bed as well as yellowing and thickening of the nail plate.
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Nail Lifting (Onycholysis)  Information for adults

Picture of Nail Lifting (Onycholysis): This image displays onycholysis, which means lifting of the nail from the nail bed. Divider line
This image displays onycholysis, which means lifting of the nail from the nail bed.
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Overview
Nail lifting (onycholysis) is the spontaneous separation (detachment) of the fingernail or toenail from the nail bed at the end of the nail (distal) and/or on the sides of the nail (lateral). The appearance of nail lifting may resemble a half-moon, or the free edge of the nail may rise up like a hood. Nail lifting creates space under the nail that gathers dirt and debris made of protein in the nails (keratin). As water accumulates under the nail, bacteria and yeast can also cause the area to become infected.

Nail lifting may occur with other skin conditions, such as various forms of eczema (including hand dermatitis), psoriasis, and lichen planus. Nail lifting may also occur with underlying medical problems, including thyroid disease, pregnancy, some forms of infection, and rarely some forms of cancer. Other possible causes are injury to the nails, use of nail cosmetics, and aggressive manicures.

Nail lifting may be caused by some medications, such as chemotherapy and drugs made from vitamin A. Some medications (commonly tetracycline) may interact with sunlight to cause nail lifting.
Last Modified: 22 Dec 2008