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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.
The lump is likely a hematoma from collection of blood. The injured blood vessels leak blood collecting in the pocket. This pooled blood can get infected sometimes. Infection can cause headaches, nausea. Hence, you will need to see your doctor for clinical evaluation. Infection will require antibiotic course and drainage of the lump. 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/