Right side, as you are sitting on the bike. If that's what you are saying too, it might be the angle of the picture that skews the perspective.
I unfortunately didn't notice it when I was looking at the bike, so didn't ask the question; I didn't see it until the sunlight caught it. I assume it is from an impact, but it looks mostly to be on the surface.
The tail section decals had peeled a little on him, so he pulled them off, and decided he liked it better without. The outline of where they were is still there, and I don't see any damage.
'96 DR650, '01 SV650, '10 Aprilia Tuono 1000R