Rash between breasts?

Hey so I've had this for quite some time and can seem to figure out what it is. Has anyone else experienced this? Not really itchy or painful.

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STRECHMARKS OR RASH? I have these weird red lines between my breasts or spots. Feeling extremely insecure rn. Idk if it's a rash or strechmarks due me loosingweight, I didn't change my

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Rash type thing between breasts would it be worth calling GP

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