This happened to me. I've got quite fair skin (brown hair, blue eyes, freckles etc - Not sure if that makes any difference). I was told by my GP that this wasn't uncommon but it's always worth getting these things checked out. I also developed a wierd spot like thing on my leg; it turned out to be a 'harmless tumor'. It's tiny and is just a red little bump but totally, totally harmless. No one can really notice it but me. But can happen if you get a scratch or bite and your body goes into overdrive to heal it; creating more skin tissue than necessary and can happen more often in pregnancy. (well this is what I was told by my gp).
It's amazing the effect pregnancy has on your body though....!
Bookmarks