A dark spot showing up on the penis is not normal, it could be Erythroplasia of Querat--go and get it checked out as soon as possible.
....also, if something is skin cancer, it doesn't have to come from a mole. Skin cancer is normally characterized by asymmetry, irregular borders, variegated colour and a diameter larger than 5mm...it can also eventually become tender, ulcerated and bleeding. Early on, though, it's not like that....check it out, especially if it's on your penis.
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