Mouth ulcers are common in hiv positive patients.

They commonly occur in stage 2 disease.

Most common causes are herspes simplex, apthous/stress ulcers, vitamin b deficiency, oral candidiasis.

some are very painful like in oral candidiasis and some complain of difficulty in swallowing.
Treatment depends underlying cause likeantifungal treatment for candidiasis.

Asses the stage and start Anti retrovial treatment