I have fungus on one toe on my left foot, but it hasn't spread. it hurts only if i touch it. what is an effective way to eliminate the fungus?

Topical antifungal: If it is truly fungal a topical antifungal for 2 weeks should do the trick. If not resolved in 2 weeks see a podiatrist for help.

Acute athlete's foot: The first thing that comes to mind is that this is one of the presentations of acute athlete's foot. Use drying soaks (epsom salts or dilute vinegar) and a topical antifungal... I prefer patients use lotrimin ultra or Lamisil (terbinafine) cream. You can use certain-dry pads or solutions to decrease perspiration. If this doesn't work, see a podiatrist and be sure to inform them of what you have tried already.