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.
Warts (Definition) 1  Warts are outgrowths of the skin, usually caused by a virus. They are self-limited, meaning that they can go away on its own after a few years. ...Read more. 2  Verruca is the medical term for a wart, which is a non-cancerous skin growth caused by viruses. ...Read more.