Could it be a cafe au lait mark? Both my boys have these - they are pale brown and the same texture as skin if you know what I mean - like a freckle. I think they can develop rather than be there from birth - I don't think the boys had them when they were babies. If you google this you could get some pictures to compare it with. My dd2 has also got a naevi on her face - this is darker brown and a bit hairy(charming!)My dd1 has a little one of these on her back. Both were pointed out to me at birth. I am moley and freckly as well and ds1,2 and dd2 all have red hair. I don't think it's anything to worry about, but perhaps ask your health visitor.