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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
That is concerning.
There may be abscess formation due to the pus collection.
Secondly, there can be antibiotic resistance --meaning amoxicillin is not good enough for the infection.
Given these two possibilities and your husband being treated for cancer, it is better to get this checked soon preferably in ER.
Applying ice and over the counter ibuprofen may help with pain and inflammation.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/