Take a moment to inspect yourself. You probably have hundreds of small moles all over you that you’ve acquired throughout your lifetime. You’ll start noticing them on your child’s skin as early as age two. Their numbers increase with sun exposure, and regular sunscreen protection can apparently limit their proliferation. Small moles rarely undergo potentially cancerous transformations, and if they do, it usually happens later in life. On the other hand, very large moles, especially those with hair on them, bear a more significant risk of cancerous transformation and should be evaluated regularly by a dermatologist.