Which of the following may be involved in the disruption of the vermilion zone and may make it hard to determine the exact location of its mucocutaneous junction between the lips and the surrounding skin?

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Disruption of the vermilion zone may make it hard to determine the exact location of its mucocutaneous junction between the lips and the surrounding skin.These changes may be due to scar tissue from past traumatic incidents,developmental disturbances,or cellular changes in the tissue such as occur with solar damage.These changes may also represent a more serious condition such as cancer; however,this can be verified only with tissue biopsy and microscopic examination.If this change is part of a past history of a cleft lip,this also needs to be noted in the patient record because of its impact on dental care.

Which of the Following May Be Involved in the Disruption