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This is Dr. David
you could see an ENT or ear nose throat doctro
a large lump behind the ear could be enlarged postauricular lymph nodes which can swell up due to infection or allergies.
or a blocked salivary gland from a stone can cause swelling of salivary glands.
an ultrasound of the area can check on these lymph nodes and see how large they are.
keflex is an antibiotic and could help fight bacterial infection.
I hope the ER did a CT scan or ultrasound of the area to check on lymph nodes.
they should have referred you to see an ENT doctor for follow up
if the lump doesn't get better in 2-3 weeks, you might need a biopsy of the area to get more information.
let me know if you have questions.
Thank you for requesting me to answer this query.This is more likely to be either a allergy or a n acute infection for the lump to appear so rapidly.
An experienced Surgeon or Physician will be able to evaluate the CT scan ,especially after it has been commented on by the Radiologist.The reatment will depend on the findings in the Scan.