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If there is a previous history of cancer (I am not sure which cancer it was), then the painful lump behind the ear could be a cancer metastasis. It can also be an infected cyst or an abscess or boil. You will have to try to get some medical aid, say a free clinic or something because this needs further investigations. A fine needle aspiration should be done to know what is there inside the lump and do a cytology study to see what it is made up of.
Hope this helps. Take care!
well the person that told you that might be right so maybe you should go just in case for safety and it might help especially if it's behind his neck it could swell up and close his throat...brittany
Do you have a free clinic nearby that you could go to? Sometimes hospitals will offer free clinic days to help the uninsured.
It concerns me that your bf has a history of cancer and (it seems) the PA didn't take that into serious consideration. If nothing else, you might want to go back to the ER and cross your fingers that you get a different PA this time.