Jogger's nipple is fairly common in male athletes. The technical name for jogger's nipple is fissures of the nipple or dermatitis of the nipple. It's more common in male athletes than female since most women wear a bra when working out, and that protects the nipple from jogger's nipple. Jogger's nipple occurs when the nipple and the areola become irritated as the nipple rubs up against damp, rough fabric. The more the nipple rubs against the fabric, the worse the irritation gets. This causes crusting, soreness and even bleeding of the nipple tissue. While the sore itself is mild, it's very painful, especially during cold weather when the nipple becomes erect. While jogger's nipple is common amongst runners, other athletes such as rowers, cyclists and people who engage in aerobics can also get it.