Psoriasis can dramatically alter the appearance of fingernails and toenails. One of the most common effects of nail psoriasis is pitting, the formation of small, pinhead-sized depressions. Some individuals experience nail whitening or yellow-red discoloration. In some cases, the skin under the nail thickens. Rarely, people with nail psoriasis develop onycholysis, meaning that their nails loosen or separate. Psoriasis can also make the nail brittle, leading to crumbling. Symptoms vary depending on which structure within the nail the psoriasis affects. Many of the condition’s effects are due to faster keratinization, the process through which new nails form. There are also some links to nail fungus as a possible cause.
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