In anatomy, the areola is a small circular area on the body with a different histology from the surrounding tissue. The term is most commonly used to denote the pigmented area on the human breast around the nipple (areola mammae) but it can also describe other small circular areas such as an inflamed region of skin.

Nipple and areola Electric one -Wikipedia CC

Nipple and areola Electric one -Wikipedia CC

Areola. (2016, May 7). In Wikipedia, The Free Encyclopedia. Retrieved 18:15, May 7, 2016, from https://en.wikipedia.org/w/index.php?title=Areola&oldid=719116966