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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 is likely an allergic reaction then since aspirin worsens it.
The swelling, is it firm or soft?
Also did you have any ultrasound before?
Can also be hydrocele from fluid accumulation --a benign cause.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/