<p>I found what looks like wrinkles on my chest today, that I believe was not there yesterday. I went to the gym and worked out, and I thought that maybe some of the weight lifting or machines caused these chest lines to form? Are these stretch marks of any kind? What should i do about them?</p>
<p>Yeah, they probably are stretch marks. It’s kind of weird that they formed so suddenly, though.</p>
<p>I used to get those on my shoulders from the standing calf raise machine (before I switched to leg press calf raises). I think that they’re just burst capillaries. </p>
<p>I can’t imagine what’d cause them on the chest, though. Maybe the hammer strength rowing machine. But if they’re near the armpit, I believe that’s one of the most common places to get stretch marks. I wouldn’t know how long they take to form as I’ve never had stretch marks, though.</p>
<p>I think they’re more like crease lines. I might’ve gotten them from doing ab exercises.</p>
<p>Wait, actually, I think they are stretch marks. I used the machine that works on the obliques, where you twist your body, so that must have stretched the skin.</p>