Look at how big his jaw and face got.
It's called growing up and filling out. That said, I've always been very suspicious of this kid being a roid-head. My instincts and guts are usually right, but your claims are pretty baseless. People get bacne throughout their teens and into early adulthood, it's quite common. Facial features and bone structure also changes as you enter early adulthood. There's no real evidence to support any of your claims so why don't you just admit that it's just your instincts and gut feeling that this kid is a roider, like myself!