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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 likely infected.
Bacterial infection can cause lot of pain and cold feeling due to drop in body temperature.
Poor circulation increases risk of bacterial infection.
Hence further evaluation is required soon preferably in ER.
IV antibiotic initially and then can be switched to oral antibiotics.
Non healing wound can be treated with wound vac devices. 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).Please bookmark my profile for asking further questions!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/