Abnormal lip morphology Cheilitis 2011-06-09T05:18:41Z Inflammation of the lip. Inflammation of the lips SNOMEDCT_US:7847004 UMLS:C0007971 UMLS:C4280288 Red and sore lips It is associated with many conditions, including megaloblastic anemia from vitamin B12 deficiency, iron deficiency anemia (which in severe cases can lead to Plummer-Vinson syndrome) and oral candidiasis. It can also be a symptom of allergies, such as allergy to Balsam of Peru. Cheilitis can also be caused by taking the (retinoid) drug Isotretinoin. It may also be a pre-malignant lesion for squamous cell carcinoma. HP:0100825