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Psoriasis, for instance, can affect the toenails, making them thicker and possibly even causing them to separate from the nail bed.

If a lamp is not at least 36 watts or the correct wavelength, the acrylates - a group of chemicals used to bond the gel - do not dry properly, penetrating the nail bed and surrounding skin, causing irritation and allergies.

A veterinarian will cut off the nail bed and part of the bone, leaving a cavity that makes it painful for cats to walk or use a litter box.

The nail bed remains blackened, but the swelling has subsided.

Lindor’s right middle finger was swollen and the nail bed was blackened.