Dioxins and furans are some of the most toxic chemicals known to science. A draft report released for public comment in September 1994 by the US Environmental Protection Agency clearly describes dioxin as a serious public health threat.
Precancerous moles are moles that are not yet classified as cancerous but may develop into being cancerous when not given medical attention at the early stage of skin condition. Precancerous lesion is actually a change in skin growth or appearance that is not cancerous.
While atypical moles are considered to be pre-cancerous (more likely to turn into melanoma than regular moles), not everyone who has atypical moles gets melanoma. In fact, most moles -- both ordinary and atypical ones -- never become cancerous. Thus the removal of all atypical nevi is unnecessary.