Just in case you needed another reason not to purchase Uggs there's this: they increase your risk of foot fungus. At least that's what one podiatrist is claiming. Dr. Olivier Zong, DPM, the director of surgery at NYC Footcare, says that "fungus breeds in dark, wet environments--conditions that are usually seen inside trendy sheepskin boots." Whats more, Dr. Zong says that once the fungus gets into your toe nails it's hard to get rid of. Fun! Luckily for Ugg-fans the world over, not all podiatrists are in agreement about whether Uggs put their wearers at increased risk for foot fungus.