There is estrogen in Yasmin as well, albeit likely a different form. I think that some people are just more susceptible to this than others. If you plan on staying on the pill, the best thing you can do it wear a good sunscreen and a hat, stay out of the sun and tanning beds as much as possible, and apply a fade cream to lighten or remove the spots you already have. SOmetimes they go away once you stop taking the pill. Women often get this conditon when pregnant, and it is therefore called the mask of pregnancy. IT usually improves once the hormones settle back down.