Bee Sting

So I got stung by a bee yesterday for the first time. My youth leader pulled the stinger out immediately and had me pour cold water on it. It stung for a little bit but began to feel like a bruise by the end of the day. Today it still feels like a bruise and is a little itchy. I also noticed how it became a large red mark. I just noticed that it feels warm to the touch, too. Is this a normal reaction? Any tips on how to help it?