What is happening to the vermilion border of this patient’s lower lip?

Why does my lip look like this?
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Age: 62 YRS. Height: 6’ 2” Weight: 220 LBS Sex: Male BP: 95/75

Chief Complaint: “Why does it look like my lower lip is disappearing?”

Medical History: Past history of basal carcinoma on the tip of his nose

Current Medications: None

Social History: Alaskan fisherman

Scenario: Patient of record had not visited the office for 4 years. He was concerned about the appearance of his lower lip. A limited examination was performed. A clinical photograph was taken (see Slide # 32 showing Loss of Vermilion Border of the Lips). He needs routine maintenance appointments and a full mouth radiographic series.

 

In 1-2 paragraphs please address the following questions .

What is happening to the vermilion border of this patient’s lower lip?
What is involved in the loss of the vermillion border?
What serious complications could be involved?
What could prevent a serious complication?