Kitten with a red bottom after going to the toilet?

I'd wait and mention it to the vet on monday.Make sure you do.Other then that if it happens again wipe kittens bum with a cotton ball Dipped in warm water.Pat dry apply petroleum jelly.it won't harm the kitten if she likes it off.In fact if you put a little of it on her tongue once a month she will not get fur balls.Or you can apply it to her paws just a little .She'll lick it off.