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This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
Is the bump painful?
Can you upload a pic here?
THis is likely a old healed scar from probably friction.
This is not a STD like herpes which will cause multiple painful blisters.
Syphilis will cause a hard indurated ulcer.
No other infection will present like this.
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