question: For a while now my left armpit has been swollen. I did have a rash over the top of both my breast it was a small rash while I was pregnant. I just thought it was a heat rash, it did come back few months after I gave birth but again I thought It was a heat rash because it only lasted a few days. But the swelling remains in my armpit. I was wondering if I should be worry. There is no pain or tender when touched.