Thanks for writing in.
I read your problem,As you provided the detail it seems that There is an infection in that area,reasons could be-
Infection because of impacted wisdom tooth
,this infection is because of food impaction
in that area if untreated it will destroy the underlying bone.
I would like to tell you that wisdom teeth are vestigial,they play very little role in food chewing so i will suggest you visit to an oral surgeon and get the extraction of this wisdom tooth done.
So i will suggest you nothing to get worried,Visit to your dentist
as soon as possible and get the thorough examination done including x-ray and for infection take proper prescription and follow all the given insturctions and take a proper treatment.