Dent/dimple in breast

Hello

i was just wondering if anyone has experienced a dimple/dent in their breast please? I’m waiting for an app but going out of my mind with worry. I’ve no lump just the dent. 

if I raise my arm in a certain way or flex my breast, there is a small, faint dent in my breast. So very hard to find, so not sure how long I’ve had it. 
I suffer with health anxiety and made the mistake of googling an now in an absolute mess.

im unsure if this can be for a benign reason, or if always caused by something sinister.

Thanks for talking time to read and provide support