Did you maybe hit your jaw/mouth? Or brush your teeth too hard? Those are the only reasons I can think of. But you should go check it with a dentist in case there may be something bad like infection or other things. If it hurts maybe try to compress it with ice?
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Gargle with saltwater . It works with me , try a few times more
not necessarily but its probably your gums that are bleeding
if it persists you should definitely get that checked out!
Did you maybe hit your jaw/mouth? Or brush your teeth too hard? Those are the only reasons I can think of. But you should go check it with a dentist in case there may be something bad like infection or other things. If it hurts maybe try to compress it with ice?