Why is my toilet seat turning blue? The strangest thing has happening. The back of my toilet seat has a blue tinge on it. I don't know where it's comming from. I check my clothes, hiney and family. We wash ourselves to make sure it wasn't dye comming from our clothes but still no clue. So I googled it and was surprised to find out that other people experienced the same thing. They concluded that it was hormones due to pregnancy, but I'm not pregnant. And this hasn't happen before my weight loss surgery. So I wondering is it due to the hormones being change from the weight loss surgery? Has any weight loss patients experience this strange thing happening to them? If so would you spread some insight on it?