Atypical moles, or dysplastic nevi are common on many people and don’t often become melanoma. It usually is the factor of UV radiation (sun or tanning lamp) and the mole’s DNA changing from this exposure. Most people stop developing new moles in their 20’s. But there are exceptions. Some folks have more than 20 of these moles and need whole body photography to really follow them for any change. I’m married to one! He has never had melanoma thank heavens. Only room for one of us in the family to have it.