If you see water forming around your toilet, you probably have a damaged wax toilet ring. This should be promptly replaced. The wax ring creates a seal between your toilet and the sewer pipe that sticks up through the floor (also known as a toilet flange). The wax ring is fairly easy to replace and will save you the nightmare of having to replace soggy subflooring down the road. Don't caulk around the toilet, it prevents you from knowing when the seal is leaking.
I keep a wax ring for as a spare and the innerds of the toilet workings on hand at all times. If you have it, YOU NEVER NEED IT. One thing, if you use it, find you have to adjust the toilet on the ring again, you have to use a new ring.
For years all the handyman, car fix it magazines that came to our house WERE MINE, not my husband's. Always a smart move for those guys who like to argue with you or 'presume you are not smart'.