Psoriasis causes skin scaling and inflammation. It may or may not cause itching. There are several types of psoriasis:
About half of people with skin symptoms of psoriasis also have abnormal fingernails. Their nails are often thick and have small indentations, called pitting.
A type of arthritis called psoriatic arthritis affects some people with psoriasis. Psoriatic arthritis may occur before skin changes appear.
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