hello and welcome to hcm forum,
i am glad you wrote in, first of all, i need to know that which side of wisdom tooth did you got extracted, was it left or right.
the lump which is present may be due to infection and inflammation of the gingival flap.
if the pain is present on the same side from where the wisdom tooth was removed, then may be a tooth remnant is present following extraction, but if not, then it is due to pericoronitis
, i.e inflammation of the gingival flap that covers your erupting tooth(wisdom tooth).
i would advise you to perform warm saline rinses(3-4 times/day),
use an antibacterial mouth rinse(betadine
and kindly visit you dentist
who will prescribe you medications after a thorough clinical check-up.
i hope i answered your query,
i wish you good health.