Ladies panties change Colour after a while and this is because of how the body is meant to work naturally.
As females our private parts are self cleaning, and this is often the discharge that you see.
This discharge is what causes the change in colour of the panty, because it contains some acid. The acidity reacts with the material of the panty and the colour changes.
This shouldnt be alarming as it is completely normal, it is something that all females go through.
The only time you should be worried is, if your discharge contains a foul smell, of it is lumpy, if you feel itchy, if you are red, if there is a rash or if your discharge has a colour that is not normal.
Otherwise, it is just the body and its way of showing you that it is functiong as well as it should be.
Source : https://www.google.com/url?q=https://www.thesun.co.uk/health/4992667/bleached-patch-panties-vagina-to-blame/&sa=U&ved=2ahUKEwjmgvDWx6z0AhUz7rsIHTbiCk4QFXoECAoQAg&usg=AOvVaw39m90Qv8qIHplDinQ3IKJ7
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