When I make lip balm (or a lotion bar, which is basically a big lip balm), I put some water in a saucepan, then I put a small plate in the saucepan. I put my oils, beeswax, etc in a glass measuring cup and put that on the small plate. I don't want the glass measuring cup touching the saucepan directly. It might be fine for the glass measuring cup to rest directly on the saucepan, but it makes me nervous.
If you choose to make a lotion bar, you can save an old roll-up deodorant container, clean it out, and pour your lotion bar in that.