For almost a week i have had a bump in my underarm area. At first i thought it was from my underwire cutting into me. I stopped wearing the bra once it appeared but the bump still got bigger. By the second day a red rash has come in and the bump has turned a red and purple color
.Take some over the counter pain reliever and consult a doctor for examination and antibiotics prescription.In the meanwhile apply some topical antibiotic like Mupirocin or Neosporin on the bump.
I hope that helps.Take care and pls do keep me posted on how you are doing or if you have any additional doubts.Kind regards.