Bee Sting

I saved three bees today from inside the house. The first two I trapped with a glass and cardboard from the front windows. The third was flying around the dining table and actually lit on my finger when I held it out for that purpose; I then carried him outside where he flew around and then landed on my head for a moment before flying away. About 15 minutes later as I was sitting on the patio I felt something on me near my left shoulder and put my hand there absent-mindedly. A bee flew off and my finger came away from my skin with this stinger. Poor bee!