Wasp Sting?

So I went outside to say hi to my mom and as I was walking something hit my arm and then I turned around and looked behind me to see like 4 or 5 wasp chasing me so I ran across the street and they left but then this little bump started forming on my arm and I've never got stung by anything before so I was wondering is this a wasp sting or nothing to worry about? I know you can barely see the bump so I tried to circle it. This just happened like 5 minutes ago btw. The bump itches and around the bump itches.