Have you been using any topical oilments to help with the infection? I believe there were a few different types of infections, and they could come on slowly or be very acute. Finding out if its an infection with bacteria or fungus might help you in being able to treat it, but I'd say at the very least see a pharmasist, but as you have had more than one case of this, it might be worth seeing a doctor about to make sure that it isn't a chronic thing where its just going away in certain areas and coming back up in others because it hasn't been completed purged from your system (sorry, I'm having a mental block for better words). Good luck