They are starting to rust and put them on yesterday afternoon...is it from playing or what? I do play pretty much, but a day and they have rust?!
did you put anythign on them
Do you sweat a lot? Is it really humid where you are? What kind of strings do you use?
What type of strings - brand and were they steel or nickel? Were they vacuum sealed?
exact same thing happened to me...now i never leave my guitar out on a stand...i think it's humidity in my situation.
They might have been rusted yesterday, or were starting to rust. I here this can happen on some brands of strings that package there strings openly.