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.
Skin tag or wart? 1  Skin tags are smooth and soft, whereas warts tend to be rougher with an irregular surface. 2  Skin tags are knobbly and hang off the skin, whereas warts are usually flat.  Skin tags aren't contagious, but warts spread very easily, so a sudden outbreak or cluster of growths is more likely to be warts.