Sounds lie a canker sore to me. A whole lotta nothing to worry about.
This stuck out to me on the
web search ...
Quote:
Canker sores can run in families. They may also be linked to problems with the body's immune (defense) system. The sores may occur after a mouth injury due to dental work, aggressive tooth cleaning, or biting the tongue or cheek.
Canker sores can be triggered by emotional stress, dietary deficiencies (especially iron, folic acid, or vitamin B-12), menstrual periods, hormonal changes, food allergies, and similar situations. They occur most commonly with viral infections. In some cases, the cause can not be identified.
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I had them as a kid. haven't in many many years though. My brothers used to tease me that it was a spider crawling in my mouth and biting me while I was sleeping..
Scared the crap outta me.