Which of the following is not a characteristic of major aphthous ulcers?

Major aphthous ulcers, also known as major canker sores, have specific characteristics that help differentiate them from other types of oral ulcers. One of the defining features of these ulcers is that they often heal without leaving a scar. This is a crucial aspect of their nature, as it distinguishes them from other types of ulcers or lesions that may indeed leave scarring after healing.

The pain associated with major aphthous ulcers can be quite significant, which makes them particularly distressing for individuals affected by them. This pain is one of the main reasons why these ulcers are often sought for treatment.

Additionally, major aphthous ulcers are characterized by their size, typically being larger than 1 cm in diameter. They can also occur multiple times, indicating a recurrent nature which can be a hallmark of the condition.

By understanding these attributes, it's clear why not healing with a scar is a defining characteristic of major aphthous ulcers. Thus, when evaluating options regarding their features, knowing that scarring is not a typical outcome reinforces the correctness of identifying that aspect as not characteristic of major aphthous ulcers.