It could grow back. Certain types are more likely to grow back than others. It also matters if you removed all the roots of the mole I think. The most important thing is, had the mole been there a long time, and had never changed? You just want to be sure it was not cancer of course, because now you removed the warning sign, the mole itself. If it was a typicaly perfectly round mole that has been there forever, I would not worry about it. I don’t think you can do anything to prevent it from coming back.