Please do not switch back to fluconazole or stop your treatment without consulting your doctor first. Terbinafine works differently than fluconazole and can take time to build up in your skin to become fully effective. Sometimes, a temporary flare-up of symptoms can occur during this transition. However, the return of itching and redness could also suggest a mild reaction or that this specific medication is not optimal for you. Contact your prescribing doctor promptly to describe these symptoms. They can safely evaluate your skin and determine if you should continue terbinafine, adjust the dose, or switch back to fluconazole.