why does my bra leave dark marks under breast

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  Why Does My Bra Leave Dark Marks Under Breast?
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  I have this weird dark spot under my boob where my bra wire would go and I was wondering if someone could tell me about it? I don't want to google it
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  I have a variety of spots/marks on my upper torso/under breast
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  Does anyone know what these dark lines are under my breasts? Are these stretch marks? - Glow Community
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  Discoloration under and between breasts. Help! : r/Dermatology
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  Something from My Body is Staining My Bra! - Real Food Recovery
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  I have this weird dark spot under my boob where my bra wire would
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  How often you're meant to wash your bras - and when you need to buy a new one - Mirror Online
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  I have a variety of spots/marks on my upper torso/under breast area. Any insight? : r/Dermatology
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  How To Get Rid Of Dark Skin Under Breast / Deal With Sweaty
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  Stretch marks on breasts: Types, treatment options, and risk factors