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Does the lump appear when you strain/cough or lift weight?
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Since, you have not replied I am going to give you an initial opinion and if you have more queries, you can ask.
The history and the signs and symptoms you mention indicate that this might be a hernia. The location is of an inguinal hernia and these are the most common form of hernias in men your age. You also mentioned that you have been lifting some heavy things recently and that is a factor to consider here. I would suggest that you visit your PCP and have this evaluated, since lumps and bumps are clinical diagnosis.
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