Ouch. Bloody Nipples (12 pics)
Bloody nipples is the most embarrassing injury ever assessed. Women are lucky, they won't get such kind of injury because of the sport bras.
To achieve this njury, you’ll have to run a extended amount of time, sweating profusely, and chafe the s*%# out of your nipples on your shirt, thus the constant friction destroys your little nips and creates blood. Such an injury can only be awarded to the very few runners, that honestly, just don’t know when to stop.