The photos below may be a little disturbing to some people, but they’re a provide an important reminder: Men, don’t forget that you have nipples too.

For those who may be unfamiliar with this phenomenon, it is called male nipple chafing, or sometimes, the “sad clown face”. The repeated abrasion between the skin and a wet shirt (particularly cotton) over thousands and thousands of strides eventually causes the below to happen. It’s completely preventable – band aids or a lubrication product called Body Glide will usually do the trick.

Man running with bloody nipples
Bloody shirt caused by nipple abrasion
Nipple chafing causing blood on shirt
Runner suffering from sore nipples
Office cast with bloody nipples guy