WHAT IS IT? WHAT DOES IT MEAN?

Hi ladies. Today I was trying on some clothes and I noticed this weird dark like and circles right under my boobs. I’m not sure if it has anything to do with me being over weight. I’m 5’1 and weight 200 pounds. I’ve heard that being over weight can bring skin problems like this.

( I am working on my weight loss btw)

I was just wondering if any of you ladies have any idea what this can be? Or have had it yourselves?

Thanks