I have an itchy, red rash on my armpits. One is worse than the other. There are tiny blister like bumps that if squeezed will produce a clear pus. My sweat smells different too. This happened once before about a year ago and I stopped using my deodorant and stopped shaving and it went away after about two weeks. Now it's back and I'm using sensitive deodorant, which I've been using the past year. What is this??