And it's actually a *good* thing
This bleached patch in your underwear is completely normal
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Vaginal discharge: Pantie stains are normal – DW – 08/02/2022
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Ever noticed a bleached patch in your panties? Your vagina is to blame
Does my vagina have bleaching powers?
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My girlfriend's underwear always has stains on it. Is this normal? - Quora
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Why do I still have poop stains on my underwear? - Quora