Is it psoriatic arthritis?

Could be both,i recently had flare up,and it affected my shoulders and arms pain and movement was terrible,had xrays ect,and was told it was a calcium build up on tendons caused by psoriasis,which was a new one to me,i was lucky had injections in affected areas with ultra sound guidance after three days all pain ect had gone,so see what your gp says and does but at the moment treatment is a postcode lottery,psoriasis is still a puzzle and what it can do to your health,unfortunately many doctors arent aware of this so always ask if you can see a specialist !