Reddish bump starting on side of throat, hurts to swallow

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any idea what this is starting? like a bump that is reddish irritated looking just on that one side, and makes it hurt to swallow there. i am known to have some allergy problems but never with this besides a little throat itching which does not hurt to swallow. is this part of the tonsil? i still have my tonsils. its not extreme pain when swallowing but ive noticed it get a little worse. thanks for any help

I do have same blister at same place,some of blisters I also wall of the throat.I still didn’t able to diagnose