August is Psoriasis Awareness month. Psoriasis is a skin disease but it can also lead to a type of arthritis called psoriatic arthritis. As with rheumatoid arthritis psoriatic arthritis causes inflammation and pain in the joints, can can cause disability.
Here are some posts regarding psoriasis:

Efalizumab for Psoriasis May Trigger Psoriatic Arthritis
Press Release: FDA Committee Unanimously Recommends Approval of Ustekinumab for Plaque Psoriasis
Press release: New Guidelines for the Management of Psoriasis and Psoriatic Arthritis
Biologic agents for treatment of psoriasis
Press release: Ustekinumab Phase 3 data show long-term improvement of chronic plaque psoriasis
Press release: Humira (adalimumab) Receives FDA Approval For Moderate to Severe …read more