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In page Cheilitis:

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Chapped lips (also known as cheilitis simplex[2] or common cheilitis)[3] is characterized by the cracking, fissuring, and peeling of the skin of the lips, and is one of the most common types of cheilitis.[2][4] While both lips may be affected, the lower lip is the most common site.[4] There may also be burning or the formation of large, painful cracks when the lips are stretched.[citation needed] Chronic cheilitis simplex can progress to crusting and bleeding.[2]