Re: Recurring blister/bleb
At this point, I'd call the doc. Not to alarm you, but the redness could be mastitis, and since tomorrow is Friday I'd play it safe and try to get seen before the weekend. If you need antibiotics, you want the prescription in hand, instead of trying to get one on a Saturday or Sunday.
It's weird that the blister cropped up right after you began an exercise program. Usually blisters are caused by things like teething, not by exercise. I have to wonder if it's coincidence that you got the blister when you did. But maybe an ill-fitting bra could be to blame?
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"