You'd have to have a pretty severe sunburn to get blisters, in which case, it's doubtful you'd have blisters just around your ear (although we tend to forget to apply sunscreen to our ears).
I'm more concerned about a possible infection presenting w/blisters and warm ears. Any possibility those blisters are filled w/pus? If so, then we refer to these as small pustules or larger abscesses. In either case, it's best for you to seek an evaluation by your local family physician as soon as possible before it spreads. Your ear isn't very easy to treat since the blood supply isn't as generous and there's more cartilage there than anything else.
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