I had my diepflap op on 1st Feb. I (sadly) had plenty of skin on my tummy and some of my new breast died as well and I had to go back for debridement. My new breast is a little smaller but I love the shape. I did have bruising around the underarm part but that has now all gone and I finished my last dressing change yesterday. I didn't have any skin peeling off though. There is quite a large hard lump in the breast under the arm but my specialist assured me that would gradually disappear over the next 18 months.
Even with the hard bit which I can feel with my arm I love my new booby. I am supposed to be having the other side reduced to match but I may not go through with that.
Good luck with your healing