Lip balm won't fix this. Called Angular Cheilitis, these painful splits are often caused by fungus thriving when you're low on Iron or Vitamin B2. Eating B rich foods like eggs, spinach, or Chapped Lips With Chron's Disease, Sjogren's Syndrome and Celiac Disea Red Apple Lipstick Can Vitamin Deficiencies Cause Chapped Lips? 5 reasons for chapped lips other than cold weather The Times of India Chapped Lips: Rescue Your Pout Averr Aglow Chapped Lips (Cheilitis) Condition, Treatments and Pictures for Children Skinsight