According to your sign and symptom you are suffering from swelling on the lip.
It can be due to deposition of the
lipid as very small fat bodies below the mucus membrane of the lips and it's become solid now or due to any minor treatment trauma by teeth during eating the food or due to irritation and sensitively of food .
Next Steps
as you know that best treatment depend on the complete history of the patient so take consultation from a doctor and give complete history of the patient to make correct diagnosis and best treatment will be start then definitely you will be well.
Health Tips
Keep positive attitude to fight any disease and any problem of your life.