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It's either from building muscle very quickly or getting fat; both of those things will stretch your skin. You didn't specify the context in which...

Welllll it's a powerlevel and it MAY OR MAY NOT be relevant to the question at hand, but I have some stretchmarks over my biceps; borderline...

I have some on my shoulders. I wanted huge shoulders so when I started lifting seriously I had 2 shoulder days as well as hitting them on chest...