71729
Runners , surfers , and other outdoor athletes may notice fissure of the nipple ; ways to avoid or mitigate this irritation include " nipguards " , which cover the nipple and prevent friction with clothing .
 fissure of the nipple
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 fissure of the nipple