Had a small round colorless circle which looked like a dried skin patch, and it was a bit more shiny under the light compared to the rest of the skin on my penis. The small round circle is flat and not bumpy, no itching pain discharge nothing, abstaining for the past 3.5 months. Recently had a bit of friction and it probably made the skin circle red-ish in color, any chance it could be a STD/STI?

I scratched it a bit, a bit of white-ish tiny dried skin probably came out 

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