Hi @Bravo,
I am 8 months past all my treatment. I had a lumpectomy (October 2016) with re excision, chemo, rads. I'v had up and down seroma most of the time since surgery. It has settled most of the time now, the skin is a little tougher and firmer after the radiation but is getting better , there is still lumpy tissue around the scar area and it can still be warm a lot of the time. The more physical work I do during the day, the warmer it is. I've had everything checked and my team is unconcerned and says it will get better over time. Get it check out to ease your mind but it's probably just still getting over all the nasty stuff it's been through.
xoxox.