I have this same thing in the same places mentioned above and my doctor seemed pretty sure that it was vitiligo. If this is the case then there's not a hell of a lot that can be done to remedy it, it might go away after a (totally unspecified) period of time or it might not. I was a bit worried that it would end up careering wildly all over my face at some point, but was reassured that my age (24) and the fact that it does consist of specific isolated patches mean that it's unlikely to spread any further. It STRIKES in early adulthood generally, although not invariably; obviously the contrast does tend to be slightly more apparent if you've been sitting in the sun a lot and the unaffected skin has darkened at all.
― Alex in Doncaster (Alex in Doncaster), Monday, 27 June 2005 15:11 (twenty years ago)