Scientists are starting to understand what makes one mole healthy while another turns cancerous.
WE'VE long been told to keep an eye on our moles lest they progress to melanoma, a form of skin cancer that's treatable if caught early, deadly if not. But not all moles are equal -- some are risky; others can be safely left alone. The biological roots of those differences are not really understood. However, scientists are making progress on several fronts.
