Thanks for asking the query,
Wisdom tooth is last tooth to errupt into the oral cavity and is often impacted, tilted and malpositioned.
This area is difficult to clean and often invites bacterial infections leading to redness
and swelling of the overlying gingiva
known as pericoronitis
Erruption of wisdom tooth is associated with fever
, foul smell, because of pain and swellling there is difficulty in mouth opening. This tooth does not have any role in mastication and occlusion so it better to get it extracted if it is causing any problem.
I would suggest you to visit to a Oral and Maxillofacial Surgeon,take an OPG x-ray
Take complete course of antibiotics and analgesics.
Meanwhile take symptomatic treatment like lukewarm saline gargles, antiseptic mouthwash gargles twice daily.
Hope this helps out.