A few days ago i realized there is a small indent on my left side, lower middle area (id say my 9th or 10th rib). It doesnt hurt to breath, twist, nothing, so im 90% sure it isnt broken. scared to push harder on the area, i just noticed it out of the blue, and when i suck in my stomach i can completely see that there is a difference from the other side. Please help, no clue what this could be. Is it something i should worry about?