I've been working out recently and I noticed that I'm starting to get stretch marks behind my armpits and surprisingly on my ribs too!:eek: I'm a pretty slim guy. I'm 17 and I'm 6'3 and weigh about 165, 170lbs. Does anyone know why this is happening and what can I do to help this issue. I'm trying to gain mass so I can convert it to muscle, will this get worse?

Help! :eek:

Relax, it's because you're getting bigger. It happens to pregnant women as well when they start getting bigger.

Personally, it's like a sign that tells you you're doing something right.

If you like, go to the local grocery store, pick up some vitamin e gel tabs (the ones that have liquid in them), break them and apply to the areas that get stretch marks. Also, pick up some cocoa butter (no need for fancy ones, a simple $2.99 thing will be fine), and apply as well.