"Unusual" ongoing pain

Hi everyone, I'm new to this group, thanks for adding me! I'm having a problem that I don't hear others talk about so not sure what it is nor what help to get for it. After my bmx with expanders put in (5/23/16), both sides of the outer edges and under my armpits became extremely painful. I developed deep crevice type areas and it's extremely painful to wear bras and certain clothing. My PS said she cut the bad area out (or got rid of it somehow) during my DIEP procedure (8/04/16). The first week after the DIEP I felt SO relieved because the crevices were gone and the pain was all gone. But, as time has gone on it is back again, on both sides again. I only had lymph nodes taken from my left side as there was no cancer in my right breast so no biopsies needed on my right side. Yet this problem is on both sides so I don't think it could have to do with lymphedema but thought perhaps cording, but it doesn't go down my arms at all, it's just around the upper outer area of both breasts and into armpits. I can feel hard areas that almost feel rope like. I can provide pictures if anyone thinks it can help to provide me with any answers. My PS seems to not know the cause or what it is even. Says she has never seen this happen before. I'm feeling very frustrated because living with this pain daily is tough. I know things could be so much worse, so I'm grateful this is all I have to deal with, but still, I need some relief! Any ideas? Thank you!