Brown spots around boobs??

Hey guys! Just had a quick question. So my boobs are big.  And i've recently seen brown spots 
on the crease of my Breasts i was just wondering if anyone else has them as well, cause if not i think i might just cry 😭 Just asking cause i don't want to worry myself for no reason.
My mom said it might be due to no air getting in and it's so hot?? but who knows! I'd post a photo but i'm insecure about myself. So pls no judgements, i'm going to post anonymous although. Thankyou! 🙂🙂 Literally just noticed them. 
Don't mind the red scare. it also won't go away and it was due to the medal thing in bras irritating my chest..