A defination of geographic tongue on the board is here http://www.oralcancerfoundation.org/cgi-bin/ultimatebb.cgi?/ubb/get_topic/f/1/t/000255.html , but if it is isolated to the center of the tongue this is probably not what it is. GT covers large areas and almost daily changes patterns. Remember that there are plenty of benign things this can be.....

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.