Over the past few weeks one of my id twins has lost the pigmentation on the backs of his hands and patches on his back. Doctors appoinment tomorrow and had a quick look on intenet - its made me worry of course! Anyone got any experience of vitiligo? I've read that it can be an indication of other problems - anyone got any advice on what questions I should ask? His ID twin doesn't have any sign of the it, but I'm worried that if it is an indication of other problems they could be genetic and both have them.