Psoriasis - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/psoriasis/symptoms-causes/syc-20355840
WebApr 6, 2024 · Overview. How psoriasis develops Enlarge image. Psoriasis is a skin disease that causes a rash with itchy, scaly patches, most commonly on the knees, elbows, trunk and scalp. Psoriasis is a common, long-term (chronic) disease with no cure. It can be painful, interfere with sleep and make it hard to concentrate.
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