What are the symptoms of psoriasis?
Psoriasis causes patches of thick red skin and silvery scales. Patches are typically found on the elbows, knees, scalp, lower back, face, palms, and soles, but can affect other places (fingernails, toenails, mouth). There are different types of psoriasis, but the most common type is called plaque psoriasis.
Psoriatic arthritis is an inflammatory type of arthritis that eventually occurs in 10%-20% of people with psoriasis. It is different from more common types of arthritis (such as osteoarthritis or rheumatoid arthritis) and is thought to be related to the underlying problem of psoriasis.
Psoriasis and psoriatic arthritis are sometimes considered together as psoriatic disease.