As a past dental assistant, sometimes when molars are erupting you can get a small blood blister where the tooth is trying to break through. Just a thought, but you should definitely get it checked by a professional.
Kathy

Kathy wife/caregiver to:
Kevin age:53
Dx 7/15/11
HPV16+ SCC Stage IV BOT/R
Non smoker, casual drinker
7/27/11 Cistplatin, taxotere,5FU 2/3week sessions, followed by IMRT 125cgy x 60 (2x daily) w/Erbitux weekly. Last rad 10/26/11. Last Erbitux 10/27/11
PEG placed 9/1/11 Removed 11/8/11
Clear PET 10/12 and 10/13 and ct in 6/14