I have a new mole on my nipple. Is it dangerous?

Mole. Any new mole that is dark, changing color or size, has an irregular border, various colors, itches, bleeds, etc. Should be evaluated for skin cancer by a dermatologist. It could just be a normal mole or a non cancerous growth. Without close visual inspection it is difficult to determine the severity of this mole. See your dermatologist to be safe.