Hi Lauren Smith,
Thanks for your post. Moles are growths on the skin that are usually brown or black. Moles can appear anywhere on the skin, alone or in groups. Most moles appear in early childhood and during the first 30 years of a person's life. It is normal to have between 10-40 moles by adulthood.The vast majority of moles are not dangerous. The only moles that are of medical concern are those that look different than other existing moles or those that first appear after age 30. If you notice changes in a mole's color, height, size, or shape, you should have a dermatologist (skin doctor) evaluate it. You also should have moles checked if they bleed, ooze, itch, or become tender or painful. Hope this helps?