Since your mother is a physician she should be insisting on a biopsy instead of dismissing it. Delaying could mean the difference between something that can easily be treated or the sore spreading and if it would be cancer it could be fatal. Even though you are dependent on your mother, you are old enough to speak up and explain to her this is not going away and must be dealt with. With her medical background she should understand the seriousness of your situation. At the very least a biopsy would give an answer as to whats going on so a solution can be found.

Good luck!

Christine
SCC 6/15/07 L chk & by L molar both Stag I, age44
2x cispltn-35 IMRT end 9/27/07
-65 lbs in 2 mo, no caregvr
Clear PET 1/08
4/4/08 recur L chk Stag I
surg 4/16/08 clr marg
215 HBO dives
3/09 teeth out, trismus
7/2/09 recur, Stg IV
8/24/09 trach, ND, mandiblctmy
3wks medicly inducd coma
2 mo xtended hospital stay, ICU & burn unit
PICC line IV antibx 8 mo
10/4/10, 2/14/11 reconst surg
OC 3x in 3 years
very happy to be alive smile