Dear Katie,
If you have a sore behind you can use witch Hazel ointment. I live in Australia and you can buy this from a health food store. The brand I use is called Sunspirit. It is really good and I can guarantee you sore behind will feel better as soon as use it and will be almost completely healed in 24 hours. Do a goole search for it. I'm sure you would be able to find similar all over the world.
Joan