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.
Warts are generally caused by a human virus known as papilloma while moles are generally related with age and caused by hormones and environmental factors. There are cases when kids are born with moles but in general moles on the face increase with increase in age.
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.