looking for waterproof dye or stain for discolored skin on some areas of face.

Hello, I am in search of some dye or cream for discolored skin on some areas of face. I need something that is safe to use and waterproof. I mean I need something which once applied stays on face for a week or so Even after having bath. I came across some camouflage concealers for vitiligo but I need something that is waterproof. I will really appreciate if anyone can suggest me anything the best product in market. Thanks in advance