It depends on the kind of pain you're feeling. Is it a sore, achy type feeling or does it feel like a bruise? If it's a sore feeling, use heat to relax and help heal the muscles, and it should relieve some of the stiffness.
It's unlikely that it's a bruise-ish pain, unless you're creatively clumsy like me. If there is bruising, use a bit of ice to keep swelling down. Make sure if you do use ice that you leave it on for say, 5 minutes and then off for another 5, so that you don't get frostbite or just plain too cold. :)