Your problem seems to be because of Halloween candies and it is not associated with ear infection
.These blister might appeared as a result of allergic reaction
.Mostly these blisters are self limiting and disappear after 10- 20 days.Till they disappear you need to apply chlorhexidine
anesthetic oral gel which is available as over the counter medicine and you should start with some multivitamin
. This will provide you relief.