I have been diagnosed for about 7 years now and have not responded to any of the more traditional treatment, so I am currently using Simponi - a biological modifyer, the second one I have been on.
One thing I have noticed recently is how long it takes for my wounds, such as minor scratches, to heal. Sometimes it can take weeks! I am wondering if this is a side effect of the immuno-suppresant drugs, or just another one of those things that seem to come along for the PsA rollercoaster ride.
I too have slow wound healing. I kept thinking that I had diabetes because I knew that slow wound healing is a symptom of that. It took me a long time to figure out that the wound was healing, the scar just developed a form of psoriasis and took weeks or even months to go away. If I get a scratch that doesn't even break the skin I will develop psoriasis in that spot. I don't know if that is what is happening to you, but you could ask your dr. If it is, what I do is after the wound is mostly healed over I use a little steriod cream, it still takes awhile though. Good luck with the Simponi, I hope you finally found something that will work for you.