Those bumps are most likely what knolwn as "lipoma"...I believe that's how it spelled. They're harmless fatty deposits found throughout the body, I have a few. I guess they can be surgically removed, but they're harmless. When dieted down they kinda shrink, which is what I'm wondering...if these are 3 week out pics, how much does he possibly have to lose? Hmmm....anyway, from personal experience and reading up on it, they seem to get 'larger' when you're more bulked up (ie, fatter)....which is why bodybuilders seem to get them more than most. Your average fat guy has loads of em, but you don't see them due to the fat.
That last bit is speculation on my part, but it makes sense. I've seem em on others as well, sometimes in the abs. I'd assume the less fat you put on bulking, the less chance of developing them or making the ones you already have 'larger' ...though in general they're not that large as you can see.