http://www.skincareguide.ca/articles/ Psoriasis articles written by internationally recognised dermatologists. http://www.skincareguide.ca/articles/psoriatic_arthritis/achy_joints_itchy_skin_psoriatic_arthritis.html Psoriatic arthritis is a less common form of arthritis and occurs in approximately 30 per cent of people who have psoriasis (a disorder causing areas of the skin to become inflamed and be covered with silvery or grey scales)...