im 13 and i have red marks around my breasts, is that natraul?? Is that a sign of breast cancer??

Meg said everything I wanted to say. Especially if your chest has grown recently, it's a good chance that they are stretch marks (which are perfectly normal on breasts as breasts usually develop quicker than your skin can expand).

Like Meg said, don't freak out too much and see a doctor if you are really worried.

It is probably nothing. Especially at 13, your body is still developing, so you will have some weird stuff going on.

The first sign of breast cancer is a lump under the skin. I'm pretty sure a google search will give you directions on how to check yourself.

If you are really concerned, ask a doctor...but I'm pretty sure it may be stretch marks (the lines your skin gets when it grows a lot in a short amount of time) or something along those lines.