Fungal infection on foot. Present 8+ yrs. Comes on as blisters, fades over time. I used terbinafine for 9mo. Worked but infections back. What to do?

Infection from withi. You may need an oral antifungal medication to kill the infection from within. In addition, you should get your feet examined to make sure you don't have a bacterial superinfection. Third, disinfect all shoes, slippers, footwear with an antifungal spray/vapor. Fourth, wash all socks in hot water. Either way, have your feet examined by a podiatrist.
Have it looked at. You may have been re-infected and may need to be re-evaluated. Try to disinfect all your shoes, slippers, and footwear with an antifungal powder or spray. Have it evaluated by your podiatrist.