To prevent nipple chafing, apply lubricant before exercising

[u/WhoaShutItDown]

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[u/WhoaShutItDown]

“I’m petrified of nipple chaffing. Once it starts, it’s a vicious circle. If you have sensitive nipples, they chaff. So they become more sensitive, and they chaff more. So I take precautions.” - Andy Bernard

[u/Moggy-Man]

I could also see this as water damage on a while ceiling, coming from a room above.