mancha / protuberancia en el eje del pene

I had protected sex 8 months ago. Never had unprotected sex. Noticed one small bump / spot on penis 3 days ago. Its darker than the flesh. It does not itch, no irritation, no pus, no pain. I also have a blackhead next to this bump. I am a bit worried. Please advice.

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Guys, Please help ??