I believe (but don’t know for certain) Trayvon has a large tatto on his upper left arm. He doesn’t have one in the pic you’ve posted, but he is a few years younger (than in the picture of him with the upper left arm tattoo taken from Twitter). The close up picture of the tattoo on his upper arm (taken from MySpace) appears to be the same tattoo that he has on his upper left arm in the picture taken from Twitter. Does that make sense?
Not unless somebody reversed the photo in an image processing application. The large tattoo in the MySpace photo appears to be on a right upper arm, not a left upper arm, doesn't it?