Glad to hear that the ENT doesn't think it's cancer. Keep an eye on it (without sticking your fingers down there, LOL!) and see how it does; perhaps it will just go away - I think sometimes there can be viral infections that just affect one side of the throat.
My dentist has a new solution that he uses (it tastes like vinegar) to detect cancer. The patient rinses his or her mouth with the stuff and then the dentist shines a special light on their mouth and it shows up any abnormal areas. You might want to ask your doctor or dentist about that if you still have this problem. Or, a brush biopsy might be all you need.
I'll be keeping my fingers crossed for you that it just goes away on its own! Best of luck, keep me posted.