I have developed a large red ring around both arm pits.  It doesent itch yet.  I take a lot of vitamins. I also excerise  4x week. I sweat when I do.  some times I dont  wash my armour shirts and shorts, because I shower immediately after excercise.  Fungal?   Thank you,   Frank
Hello and thanks for your questions. It sounds fungal, though it is surprising that it does not itch. Try an over the counter antifungal cream like origin and see if this gets rid of it. If not you may need to see a doctor for an evaluation.