Good Afternoon ma'am
Have you been told it's a parotid swelling? Was an ultrasound done? Also, is there any pain?
There could be many causes, it could be intraparotid lymph nodes infection, or parotid gland inflammation, or parotid gland tumor (but it doesn't usually disappear like that)
Next Steps
We need to investigate further, to come down to a plan of action.
Health Tips
drink plenty of fluids.
notice if u have any pain in swelling, does it increase in chewing food.