[Pansy-Mae]

its a halo! .. no seriously there are glands around the areola that secrete a lubricant like substance when a child is nursing on the nipple. (cowpers glands? will have to check) anywho, its so you dont get chapped nipples sometimes they can turn white and bumpy.

Hi squirrel,
Yes, thats true, but it isn't what we are talking about here.
If you look at my not very good piccy, you'll see that there is a distinctly light coloured continuous band right round the outside of my nipple, with a darker coloured band outside of that makes the whole thing look somewhat like a target!