The bladders usually appear on the throat when tonsillitis is in place. These blisters appear right on the throat. Do not confuse this condition with the reddish throat people have during the flu, cold, or regular fever. The ulcers typical for tonsillitis are spread everywhere inside and close to the mouth. The person may notice white/yellow coverage around the tonsils. Peek inside your mouth standing in front of the mirror to catch this symptom with the naked eye. The blisters are characterizing the infection inside your throat.