Hi..
Welcome to Healthcare Magic..
I have gone through your query and can very well understand your health concerns..
As per your complain pain and lump formation at the injection site can occur due to trauma caused to the soft tissues by the pricking needle at the injection site and as you have got 5 injections as you mentioned in your question there is an increased trauma leading to inflammation and lump formation..
It doesn't seems associated with the tooth as if the lump would have caused due to infection or
abscess formation in tooth it would be located on the gums..
For this you can apply Lignocaine Gel before eating to prevent discomfort..
Alternate warm and
cold packs as it is inside mouth alternate warm and cold water gargles can help in faster healing..
You can take OTC painkiller like
Advil for relief..
Hope this information helps..
If you find the answer helpful please give me a Five Star Review and click on found the answer helpful as a token of appreciation..
Thanks and regards..
Dr.Honey Nandwani Arora..