I found this today doing research maybe this will some people as far as Psoriatic arthritis .
5 Types of Psoriatic Arthritis
The 5 types or patterns of psoriatic arthritis may evolve from one to another and they may overlap:
Asymmetric psoriatic arthritis
Most psoriatic arthritis is first noticed in this stage. Asymmetric psoriatic arthritis involves a few joints of the extremities randomly (i.e., left toes and right fingers). It affects about 30 to 50 percent of psoriatic arthritis patients.
Symmetric psoriatic arthritis
Many times, the asymmetric form eventually evolves into symmetric psoriatic arthritis, which is characterized by pain and swelling in joints on both sides of the body. The fingers and toes are often affected. This type is the most common form of psoriatic arthritis, affecting 30 to 50 percent of psoriatic arthritis patients.
Distal interphalangeal predominant psoriatic arthritis
This form mostly involves joints closest to the nails of the fingers and toes. Changes in the nails, including pitting, splitting, degeneration and other nail mainfestations are common. Other joints may also be affected. This type of psoriatic arthritis accounts for 25 percent of cases.
Arthritis mutilans
Arthritis mutilans is a rare (5 percent of all cases), painful, and destructive type of psoriatic arthritis. It is characterized by a condition called enthesitis (inflammation where tendons and ligaments attach to bone) and also is characterized by resorption of phalangeal bones.
Psoriatic spondylitis or axial arthritis
This form is characterized by sacroiliitis (inflammation of the pelvic area where the sacrum joins the ilium bone) and spondylitis (inflammation of one or more vertebrae) occurring separately or together. It affects between 30 and 35 percent of psoriatic arthritis patients.
According to the American College of Rheumatology, about 15 percent of psoriasis patients develop psoriatic arthritis. Arthritis may develop before psoriasis in some patients. Seems you dont need to have skin rashes showing to actually have ( Psoriatic Arthritus ) If i'm reading this correctly here is the link I found this info http://arthritis.abo.../a/symptoms.htm