The small round scar on the upper part of our arm is very common if you are a 90s kid. People who were born before 2000 A.D. are likely to have this scar on their upper arm. It is not a thing to be scared of anyway. But it has a very mysterious secret which you might have heard about in your childhood. And with time, the topic of this concern faded off and so did the concentration towards this particular scar.