Welcome to HCM
All your symptoms give a indication towards impacted wisdom tooth
.I would like to know:-
-what's your age?
-since how long are you experiencing this lump?
If its more than 15 days than better get an IOPAR done to confirm whether its erupting or impacted.
If there is something ceasing its path then get operculumectomy done.But if that's not possible then get it removed because it doesn't help much in chewing.
Consult your dentist
for further query.