Aphthoulscer so often?

Probably stress: If you are having recurrent aphthous ulcers, most likely this is due to stress. However, it could be herpes, which also can be induced by stress. Sometimes, recurrent ulcers may also be a sign of HIV infection, so you may want to get an HIV test. Ultimately, if concerned, i would recommend seeing your medical provider to have them confirm the ulcer or perhaps biopsy the ulcer.