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Can you attach the photos here? How tall are you? How much do you weigh? Did it become a blister and rupture? Then was it crusted, and healed? Any other symptoms? Any medical problems? Any surgeries? Any medications including over-the-counter pills and herbs? Any family medical history? Did you use condoms?
If there is skin change, can you attach the photos here?
If you attach the photos, I could narrow down the cause.
Exactly where? On the glans? On the shaft?