I have an abrasion with what the doc calls "ulcers", moist, open sores producing pus that aren't healing. I had a week of doxycycline, which didn't seem to do anything. Today the doc changed to amoxycillin but I know I'm allergic to that (itch like crazy).

I'm in Malaysia, where I can just buy OTC but don't know what to get. Any recommendation? Things to avoid?