Hello ,
Yes! It wisdom tooth infection .
You dentist will take x - ray to see its postion completely impacted or partially erupted .
You badly need to do minor surgical extration of your wisdom tooth followed by Medication and topical care to avoid pain , swelling and spread of infection .
Prior to the procedure your dentist will try to reduce swelling and pain with medication .
During that medication course go for wisdom tooth extration as per your dentist guideline .
Health Tips
For time being do warm saline / warm salt water rinses . thrice daily ..