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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.
This can be caused by the bruise.
There can be a minor trauma causing the tissue inflammation.
This should improve by itself in 1-2 weeks.
Only if you develop more than lumps then infection is a possibility.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 and authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/