Hi!
This may sound a bit ridiculous, but I've noticed that I've got a lump on my chest.

I can't help but to get a bit scared, and I really want to know if this can be cancer, or if its just a muscle...

I don't really exercise that much, so why I would get one pumped muscle right there, is beyond me. I'm pretty skinny, overall

I wonder if a cancer lump can act as a muscle?

And a theory about the "lump", is that during a long time I carried all my schoolbooks in a backpack. It weighed sooo freaking much, and i usually carried it on my left shoulder. Would that make my right abdominal muscles get more exercise? Cause it's pretty big, and it looks rather odd...

Thanks in advance!