Aureola

Okay kiddo, so you know how when you draw a sun with crayons, there's a bright circle around it? That circle is called the halo.

Now, people also have a bright circle around their nipples, and that circle is called the aureola. It's usually a different color than the rest of the skin on your chest - some people have darker aureolas, and some have lighter ones.

The reason why people have aureolas is because they're special parts of the body that help babies get milk from their mommy's breasts. When a woman is pregnant, her body makes a bunch of special hormones that tell her breasts to get ready for milk-making. One of the things that happens is that the aureolas get bigger and darker, so that babies can see them better and know where to go to eat.

So there you go - the aureola is like a special target on mommy's chest to help babies get milk!