Is there a relationship between the extent of skin involvement and arthritis?
No particular pattern (plaque, pustular, or guttate) or extent of psoriasis is associated with arthritis.
However, some suggest that arthritis is more deforming and widespread with extensive skin involvement as indicated by a Psoriasis Assessment Severity Index (PASI) >10 (range of PASI score: 0–72). Up to 35% report that flares of their skin and joint disease occur simultaneously.
