Which condition is characterized by the presence of scars left by ulcerations on the lips?

The condition characterized by the presence of scars left by ulcerations on the lips is major aphthous ulcers. Major aphthous ulcers, also known as major aphthous stomatitis, typically manifest as large, painful ulcers that can take a considerable amount of time to heal and may leave behind scars as they resolve. These ulcers are often deeper and larger than minor aphthous ulcers, and their effects can lead to significant tissue damage and scarring.

Cold sores are caused by the herpes simplex virus and primarily appear as blisters that eventually burst, crust over, and typically do not leave significant scarring unless there are complications. Angular cheilitis involves inflammation and cracking at the corners of the mouth, while oral thrush, a yeast infection, results in creamy white lesions primarily on the tongue and other mucosal surfaces rather than on the lips and does not usually lead to scarring. Therefore, the distinctive characteristic of scars resulting from ulcerations is most consistent with major aphthous ulcers.