If you are having swelling from few days, it might be sign of pericoronitis (infection or swelling around the erupting wisdom tooth). Has your dentist prescribed you any medicine (antibiotic and analgesic)? If yes then swelling will subside in a course of 3 to 5 days. If swelling is not reducing, you might have to get your wisdom tooth removed.
Next Steps
consult a dentist or an oral surgeon
Health Tips
avoid any hot and spicy food. gargle with mouthwash twice daily.