What to Know About Psoriatic Arthritis in the Knee

Psoriasis usually affects your skin cells, but in about 30 to 33 percent of people with psoriasis, it can also attack your joints, according to the National Psoriasis Foundation. This is called psoriatic arthritis, and it can lead to pain in your knees anPsoriasis usually affects your skin cells, but in about 30 to 33 percent of people with psoriasis, it can also attack your joints, according to the National Psoriasis Foundation. This is called psoriatic arthritis, and it can lead to pain in your knees and other joints.