Dark spots between boobs

Been noticing I’m getting these really weird blotches between my breasts , never had this before till now that I’m pregnant. I have no idea what it is ..

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Acanthosis Nigricans (AN) Nationwide Children's Hospital

Answers to dark area between breasts - DoctorBase

Acanthosis Nigricans: Treatment, Pictures, and Causes

Why some women get SPOTS on their nipples - and when it could be a sign of something serious

Acanthosis Nigricans: Treatment, Pictures, and Causes

Acanthosis Nigricans (AN) Nationwide Children's Hospital