The natural history, complications and prognosis of recurrent aphthous ulcers varies with disease severity.
What is an Aphthous ulcer?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: What is an Aphthous ulcer? [/INST] \n The natural history, complications and prognosis of recurrent aphthous ulcers varies with disease severity.</s>