
Here is some detail of the nevus you were told about, from a reliable medical source:
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A mole, also known as a nevus, is a small dark patch on the skin that is usually harmless. A mole forms when the cells that produce melanin (pigment) grow in a cluster on the outer layer of your skin instead of being distributed across a wider area.
Moles are quite common. You’re born with most of the moles you will have in life, though more can appear as you get older. An adult may have anywhere from 10 to 40 moles or more. They can appear anywhere on your body, including your penis.
While it can be a little unsettling to see any type of spot on your penis, a mole is normally a benign (noncancerous) spot that is unlikely to cause any symptoms or health problems. Several other types of spots and bumps can also appear on your penis. Most aren’t dangerous, though you may not like them for cosmetic reasons.
Some mole-like spots may need treatment, so getting a medical evaluation is always recommended. Depending on the health risks involved, surgical removal or laser treatment may be possible. For many benign spots or bumps, you may be better off living with them as they are.