I've had tons of blisters, and all of them have disappeared overnight. Most of them were result of radiation.

But shortly after surgery, I had a few that worried me, I e-mailed my surgeon, described them, he said it was normal, and it totally put my mind at ease. They disappeared in a couple of days.

Get in touch with your doctor, hopefully, s/he'll be able to tell you whether or not it's something you need to worry about.

38 yo@dx, female, non-smoker, non-drinker, SCC right lateral tongue. T2N2aMx stage IVa; 1/20/09 bilateral neck dissection, hemiglossectomy, micromets in 2 right nodes, left all clear. 33xIMRT + 3 cisplatins. Tx completed 5/08/09. PET scan 7/29/09 clear, 5/26/10 clear, chest x-ray 5/23/11 clear