Brownish yellowing around aerolas and reddish purple nipples?

I've noticed a dark ring around my aerolas, like a brownish smudging around them. My nipples themselves look very red/purple and if I take a flash picture I can see the individual purple veins in them. My breasts are really veiny as well. I know your nipples are supposed to get darker in pregnancy but is it normal for there to just be a dark ring around the aerola and not the whole thing get darker and what I described? They just look bigger and browner. I'm Caucasian by the way but fairly tan.