If you are sure that it is because of the wisdom tooth get it removed as soon as possible.
Yes it is necessary. Leaving which can invite various complications
It is just a misconception.
A atraumatic extraction would never cause any harm to the jaw line
Next Steps
visit your dentist and get the tooth extracted
Health Tips
Luke warm salt water gaurgle will help in maintaining the area clean
ice pack can be used for temporary pain relief.