Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems like a swollen post auricular group of lymph node and the most common cause seems to be infection and due to infection there seems to be Reactionary
Lymphadenitis..
You should consult an Otolaryngologist and he can advise you to take antibiotics like
Augmentin, anti-inflammatory painkiller like
Ibuprofen, do alternate warm and cool compresses over the lymph node..
Avoid pressing over it as it can increase inflammation and it can become further painful..
In case if it does not improve get an FNAC/
Biopsy done to rule out the exact cause of the swelling and treatment can be planned accordingly..
Hope this information helps..
Thanks and regards.
Dr. Honey Nandwani Arora.