What is thd best way to treat an infection of the gums caused by wisdom teeth?

Gum infection: Infections are caused by microorganisms, in this case bacteria, not by a tooth. Malposed difficult to reach for cleaning teeth can allow bacteria to collect, and thus gum disease. See your Dentist to determine if you need removal of the wisdom tooth, treatment of your gums, or modification of your Oral Hygiene. Can't fix this with a pill or an OTC.

Have it evaluated: Wisdom teeth are frequently in a malposed position that makes it difficult or impossible to keep clean. That can caused gum disease problem which can affect adjacent tooth also. Have your dentist evaluate your gums for signs of infection and whether to refer or to treat the problem.