Extra skin after mastectomy and reconstruction. Any suggestions?

I had a double mastectomy with reconstruction at the same time. I didn't need expanders thank goodness. I went with the same size breast I initially had and 1 breast has more skin left then the other. It's starting to feel raw as my arm rubes against the extra skin. I'm thinking of going back for another surgery to fix it. It has been 7 months since the first surgery. My dr says its swelling and tells me to massage it but I know it's not the answer. I'm not sure what to do anyone help?