Bee Sting

I got stung by a bee on Wednesday at practice and didn't think much of it. It hurt at the time and I yelped a little bit, but then I moved on with life. I did pull out the stinger but today, my hand is ridiculously swollen considering it is 3 days later. I am not sure why it would have a delayed reaction.

This is a current picture of my hands. Can you tell which one was stung?