Thanks for posting your query in hcm forum,
The lump may be arised due to the infection from the screws inserted into the gums.
Please do get the screws removed and the hole/gap at the site has to be curetted well.
The abscessed tooth has to be root canal
treated and pus within the tooth has to be drained completely.
Take complete course of antibiotics analgesics prescribed by your dentist
Maintain oral hygiene
Rinse your mouth after every meals.
Gargle frequently using warm saline and betadine
Hope this helps.