Hi @CarrieP One of the few unbreakable rules when it comes to surgical procedures is to keep a very, very close eye on any swelling or redness.
Having needles stuck in your boob is unpleasant on every level and even with the most careful attention to hygiene, infections can occur. If you are still in pain, please get someone on your team to check it out. I'm not trying to up your anxiety, but as many of us can tell you, ignoring a problem and hoping it will just bugger off can end up making things worse.
Cancer treatment can present many challenges, it's best to deal with them as, and if, they arrive. One of the things you can do to prepare is sort out your emergency contact list--breast care nurse should be top of the list but Nurse on Call is also a helpful resource if you are not sure if the thing you are worried about is really a 'thing.' You will learn to trust your instincts and your body; if something doesn't feel right, it probably isn't.
Many folk struggle with the concept of having to trot off to ED, of your GP or whoever for things you hope are trivial. We've just got to get over that--no-one is going to think you are wasting time or resources, it really, really is better to be safe than sorry. Good luck, MXX