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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.
Although the risk of cancer is very low, nobody can rule out without a biopsy.
Given the persistent sore lump, it is better to go for a biopsy after consulting with an oral surgeon.
In most cases, this is a viral infection and tends to improve gradually over time.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 fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/