a few observations...
1, most probably both, but left bicep has more SEO in it than the right. slightly deformed in the front double bi and extremely obvious in the side chest shot - epic SEO brazilian teenager forearm to upper arm ratio.
2, looks like a tricep tear. attachment from the elbow seems to have come off. more evident in the front double bi (or it could be shadow. doubt it), but then again in the side chest, it doesnt seem to be attached all the way down to the elbow here.
something else that would support point #2 would be that melvin started training in the gym again about 3 months back now. before clicking on this thread i thought "this fucker will be huge by now", but he looks like he has taken off the gym again

"lost some size, i committed to the LA expo for my sponsors but not to worry, will just fill the arms up with SEO"