What is identified by ulcers with episodic occurrences?

Recurrent aphthae, commonly known as canker sores, are characterized by painful ulcers that occur periodically. These lesions typically have a well-defined round or oval shape with a white or gray center and a red halo. They are often triggered by various factors, including stress, certain foods, hormonal changes, and possibly immune system responses. The episodic nature of these ulcers means that individuals will experience outbreaks at intervals rather than continuous ulceration, distinguishing them from other conditions.

In contrast, angular cheilitis primarily affects the corners of the mouth and does not present as recurrent ulcers but rather as inflammation and fissures, typically due to nutritional deficiencies or irritation. Oral lichen planus usually shows a different presentation, with lacy white patches or lesions in the mouth rather than distinct ulcers that appear episodically. Herpes simplex virus typically results in vesicular lesions that can become ulcerated, but these are often more persistent and occur in defined outbreaks, such as during cold sores on the lips rather than as isolated recurrent ulcers.

Therefore, the characteristic pattern of painful ulcers that appear intermittently accurately describes recurrent aphthae, making it the correct choice.