Hi.. Thanks for the query.. Swelling, burning and tingling of inner lip can be due to any sort of allergic reaction to any food or medication if you take, while it can also be due to causes like dry mouth, lip biting habit, injury with your mouth guard or brace wires etc.. There can also be iron or vitamin B 12 deficiency.. If there are no other symptoms that can be suggestive of thrush like white patches then it does not need to be thrush.. But for a confirmation I would need images of the inner side of your lip for better diagnosis.. You can upload the same to me so that I can ask you further questions and advise you appropriate treatment.. As of now you can apply Lidocaine or choline salicylate gel over the inner lip, do cool compresses and take soft diet.. Avoid spicy food.. Take Vitamin B complex and lysine supplements daily and eat more of yogurt.. Hope this information helps.. Regards.