hello and welcome to HCM forum,
i would like to inform you that the lump and soreness is due to infection around the gum that surrounds the wisdom tooth.
sometimes, due to improperly positioned wisdom tooth encourages food impaction
this causes food particles to get trapped within the soft tissue
surrounding the tooth.
i advise you to see an oral surgeon, antibiotics and painkillers are indicated in such cases to resolve the symptoms along with warm saline rinses(3-4 times/day),
use an antibacterial mouth rinse(twice/day),
i hope i answered your query,
i wish you good health.