From what I gather is that you're stuck without access to good medical knowledge; not a good thing. Do you have access to pure 100% tea-tree oil? If you think it's spreading it could be a critter, or a fugus. Get some liquid soap, remove about half of it; add about a bottle cap full of tea-tree oil to the soap--a bit of water shake and stir. Use this in the bath and let it stay on you unitl you feel a tingel. Use full strength Tea tree oil after the bath on hot spots.