Thanks for aking the query,
Wisdom tooth is the last tooth to errupt in the oral cavity and is often tilted, malaligned and impacted in the jaw bone, this area is difficult to clean and leads to food lodgement and bacterial accumulation leading to redness
, swelling and inflammation of the overlying gums known as PERICORONITIS
Best treatment of this is extraction of the wisdom tooth, i would suggest you to visit an Oral Surgeon and get the checkup done take an OPG x-ray and plan for the treatment.
Start with the course of antibiotics and analgesics.
Take lukewarm saline and antiseptic mouthwash rinses.
Hope this helps out.