Repost: Is it normal for my arm to be sore after 12 hours of a shot?

Yesterday at about 1:50 I got a few shots. 2 in one arm and in the other. So when I got home it was really sore, then when I peeled off the bandaid and it was purple like a bruise. Then I put ice on it and it went away. But it still hurts. I hurts alot when I try to stretch the arm that had 2 shots. And hurts even more when I touch it. This is the first time something like this happened after a shot or two. Can you also explain it to me? ^.^ thanks