I have a big patch on my right cheek. I have perfectly pale and clear skin otherwise and it ruins it. Mine developed when I was 12 for no reason and has not gone away although they sometimes do go away.
I have them all over my face. I THINK mine developed when I was a smoker and drinking an awful lot while at college. They are still here and only get worse. I have not smoked or drank any alcohol for a good few years and I am a size 8-10. I DO eat an awful lot of junk food though which I think may be partly why they are getting worse. When I eventually have some money for it it will have them lasered off.