The secret behind the scar that some people wear on their arms – video

Many people have a rounded, almost identical scar on the upper arm – but why only? If you do not know the background, you will quickly get confused: after all, it is quite unusual for so many people to have a scar that looks almost identical. What can be the reason – did they all happen to have exactly the same accident that left this scar? The explanation is very simple – in the video you can see what is hidden behind this special scar!