Bleach Underwear

I was told that I shouldn't wear panty liners because they have caused me to have infection. I am really sensitive. I have noticed that since I stopped wearing panty liners that the crotch part of my panties appear to have been bleach. I have ruined about 10 pair of underwear. Do you ladies have this problem? If so, how can I make it stop?

My OBGYN told me to stop wearing panty liners because of the infections but I haven't made an appointment about the substance that is bleaching my underwear.