My teen son and i both get a small, clear blister on our palates. they last for a day or two and go away.i saw an ent but he didn't know what it was.

Infection ?: Infections usually viral on nature that disappear and reappear in times of remission and exacerbation of the virus.. Examination by a dentist and a culture may be needed..

Aphthous stomatitis: Or canker sores are the most common oral lesions. Individual ulcers typically last 7-10 days or less. The condition is idiopathic recurrent aphthous ulcers is usually self-limiting.