I just started back using blistex, but before i was using it my lips was never getting crusty so fast and forming dark crusty areas around my lips?

Cheilitis: Cheilitis is a medical condition involving inflammation of the lip. 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 and other agents. Rx with vaniply see doc if not better.