Other scholars think the drawings in the margins were a kind of moral caution, but the depiction of priests and other ranking officials engaged in sex acts suggests political origins as well. Libertine pornography was a subversive social commentary and often targeted the Catholic Church and general attitudes of sexual repression. Most of them profited by selling illicit pornography to the masses who could now afford it. Although these are the most common places for melanomas to appear, they can appear anywhere on the skin including inside the oral cavity.
Soon illegal stag films or blue films, as they were called, were produced underground by amateurs for many years starting in the s. Magnetic resonance imaging MRI is used to diagnose melanoma in soft tissue. Although rare, tumor transformation of nevi to melanoma involves the clonal expansion of cells that acquire a selective growth advantage.