Fissure of the nipple, also known as jogger's nipple, is a condition that can be caused by friction that can result in soreness, dryness or irritation to, or bleeding of, one or both nipples during and/or following running or other physical exercise. This condition is also experienced by women who breastfeed and by surfers who do not wear rash guards.

Jogger's nipple is caused by friction from the repeated rubbing of a t-shirt or other upper body clothing against the nipples during a prolonged period of exercise.

The condition is suffered mainly by runners. Long-distance runners are especially prone, because they are exposed to the friction on the nipple for the greatest period of time. However, it is not only suffered by athletes; the inside of a badge, a logo on normal items of clothing, or breastfeeding can also cause the friction which results in this condition.

The condition is easily preventable and treatable. Viable methods include:

This condition should clear within a few days. If not, medical attention is warranted. Other skin conditions such as eczema, psoriasis, impetigo, fungal infections or an allergic reaction can cause nipple pain and changes in the appearance of the skin. In women, breastfeeding (often complicated by thrush infection),, hormonal changes in early pregnancy or during menstruation, as well as certain types of breast cancer, i.e. Paget's disease of the breast, can also cause nipple soreness and pain.

Katrina Kaif (born 16 July 1984) is a British Indian actress and former model who appears in Indian films, mainly in the Hindi-language film industry. She has also appeared in Telugu and Malayalam films. She was voted the sexiest Asian woman in the world by Eastern Eye in the years 2008, 2009 and 2010. Being a British citizen, she works in India on an employment visa.

Kaif made her acting debut with Kaizad Gustad's box office bomb Boom (2003). She tasted success in 2007 with Vipul Shah's Namastey London and followed with such films as Anees Bazmee's Welcome (2007), Abbas-Mustan's Race (2008) and Kabir Khan's New York (2009). She has since appeared in critically and commercially successful films like Prakash Jha's political thriller Rajneeti (2010) and Zoya Akhtar's dramedy Zindagi Na Milegi Dobara (2011).

Kaif was born in Hong Kong, to an Indian Kashmiri father, Mohammed Kaif, and an English mother, Susanna Turquotte, both of whom are British citizens. Her parents divorced when she was very young. Kaif once stated, "My dad, unfortunately, and not out of choice, has had no influence on our upbringing, on our religious or social or moral bearings." When she came to India, she changed her surname to Kaif, because it was Indian in origin. Furthermore, Ayesha Shroff has maintained that the actress' original name is Katrina Turquotte. Kaif has seven siblings; a brother and six sisters. From Hong Kong, she and her family moved to China, then to Japan. From there she went to France when she was 8, and thereafter lived for a few months at a time in Switzerland, Poland, Germany, Belgium, and other European countries. Then she moved with her family to Hawaii, and eventually to her mother's home country of England. Although it is often assumed that Kaif is from London, she lived there only for three years before finally moving to Mumbai.