There are several types of psoraitic arthritis aka arthritis psoriasis- from a symmetrical arthritis of many joints that mimics rheumatoid arthritis, to arthritis affecting only the joints of the fingers and toes, to arthritis of the spine.

The common thread is pain, stiffness and swelling of the affected joints, occasionally with X-ray changes. If you have painful, swollen joints or morning stiffness that lasts for more than two weeks, and skin lesions of psoriasis, you should ask to be referred to a rheumatologist as well as your dermatologist.