Psoriasis is a chronic relapsing skin condition where the skin cells are made to quickly often resulting in silvery scaling areas. The onset has been reported from birth to 108. However, the usual age of onset is during the 20's. There is family history in about 66% of cases and environmental forces also seem to be at play. Trigger factors include infections (stept throat), stress and certain medications. Psoriasis can also be accompanied by Psoriatic Arthritis.