Thanks for posting your query,
you might have caused trauma to your soft tissue
, and as a normal defense mechanism of our body, a blister
like swelling developed on the palate.
I advise you to avoid picking or even popping it, it will heal on its own, ideally within 5-7 days the swelling will disappear completely.
But,if its hurting you then you may have to see your dentist
, as he/she will prescribe you a topical gel.
also, you can use listerine
even warm saline rinses(3-4 times/day) will relieve symptoms if present.
I hope this information has been both informative and helpful