Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain in case if you have pain in tooth in lower right back region then the swelling should have been in the area under the jaw due to
swollen lymph nodes [swollen submandibular lymph nodes]..
Although the numbing of lower lip can occur in case if there is formation of
dental abscess under the roots of infected tooth it can cause nerve compression leading to numbing of lip and even the jaw..
But swelling of lip and numbing seems to be due to
allergic reaction and it needs evaluation..
As of now you can take anti allergics like
Allegra or
benadryl to relieve the swelling..
Do cool compresses..
You should also consult an Oral Physician and get evaluated and a thorough clinical evaluation and investigations like x ray of decayed tooth can help in diagnosis and treatment can be done accordingly..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.