I have no idea what this is it does not bother me but I am very concerned!
Another picture
I have a white bump on my insiide right cheek which I had not noticed until my dental hygienist pointed it out about 6 months ago. My dentist said harmless though a surgeon could cut it out. On the principle "If it ain't broke, don't fix it", I have done nothing. But I would be interested to know what yours is, if you find out. Please post any result.