Class Trematoda: Infect the internal organs of hosts. Parasitic Can be endoparasites (live in the host) or ectoparasites (attach to external surfaces of the host. Size: ~ 1 cm to 10 cm Covered in an unciliated cuticle. Usually require 2 hosts to complete it's life cycle.
The difference between a mole and a wart is that moles are not contagious, but warts are. A mole, or nevus, is a collection of skin pigment cells. When they are small, they look like small brown dots. When the collection is larger, and slightly deeper, it can cause a raised skin colored bump over it.
Moles (Definition) 1  A mole (also called a nevus) is a localized overgrowth of pigment-producing cells (melanocytes) in the skin. 2  Warts are outgrowths of the skin, usually caused by a virus. 3  Verruca is the medical term for a wart, which is a non-cancerous skin growth caused by viruses.