Hi Youngin - Sounds like the doctor doesn't think there is anything to be concerned about, and maybe not, but it still concerns me a little bit that they did not do a biopsy. There are different kinds of biopsies and you can read up on them here: http://www.oralcancerfoundation.org/diagnosis/index.htm
(read what they say about "oral brush biopsy") My son went to UT Medical Center and they have a section on their web site where you can check the creditials of all their doctors. I tried to find a site for Park West but couldn't see anything similar. If you still feel the need to check with a different type of doctor, my son's maxillofacial surgeon is dr. Eric Carlson at UT MEdical Center and the Dr that did the biopsy is Dr. William R. High on Peters Road (not too far from Park West). I probably just worry too much, but I guess mothers just do that. Perhaps someone else here can give you their take on this.