The nipple is often one of the more forgotten parts of sensitive skin on the body (until it features in a Rihanna video, obviously), but it's more of a delicate flower than it seems. As anybody who's ever had an irritated nipple, a sebaceous cyst on the areola, or any kind of chafing can testify, treating your nipples badly does not pay. (Runner's nipple, anybody?) And there are certain substances that should be kept far, far away from your breasts' pointy parts, for the health of everybody involved.

THING YOU SHOULD NEVER PUT ON YOUR NIPPLES

Nipples have had a slightly interesting ride through history. Hippocrates deemed blood coming out of the nipples as a sign of madness in women (when likely they were just having some very severe medical difficulties.

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