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.
A wart is a small growth with a rough texture that can appear anywhere on the body. It can look like a solid blister or a small cauliflower. Warts are caused by viruses in the human papillomavirus (HPV) family. The appearance of a wart depends on its location on the body and the thickness of the skin. Palmar warts appear on the hand. Plantar warts affect the feet. As many as 1 in 3 children and teenagers are estimated to have warts, but only 3 to 5 percent of adults.