This is more common in men than women. It is in effect a friction burn known as chafing caused by constant rubbing of a T-shirt on the nipple. It is often more likely in cold and wet weather. Jogger's nipple can be prevented with nip guard or band aids. True story - last year I was looking through the finishing line pictures of the Tely10 trying to find myself and I saw more than 1 guy with blood running down the front of their shirts.
I'm a girl from around the bay. A runner, mother, daughter, sister, wife, an average run of the mill Newfoundlander with an overly active imagination.
I spend my days making mistakes and then trying to fix them before I get caught.
My life is random!