Is it normal for moles to just suddenly appear?

    It can be normal for new moles to appear. Moles do not only occur in the first two years of life, but when they do, it is considered a birthmark. When a new spot appears, the important thing is to remember the ABCDEs of moles and melanoma. Asymmetry - if you were to visually split the lesion on an axis, would both sides match up or would there appear to be asymmetry present? Borders - does it have irregularity in its border? Color - is the color varied throughout such as different shades of brown, grey, tan or black all within the same lesion? Diameter greater than 6mm or the size of a pencil eraser? Evolving - once you notice the lesion, does it continue to change? If any of the ABCDEs are answered "yes", you should have it evaluated immediately by a dermatologist. Even if you recently had your annual full body skin exam as recommended by the American Academy of Dermatology, it is important to have a professional dermatologist evaluate new moles, especially when they violate the ABCDE rule.