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 on a person's hands or feet. It looks like a solid blister or a small cauliflower. There are several types of wart including common warts, verrucas, plane warts, filiform warts, and mosaic warts. Most warts disappear on their own and do not need to be medically treated.