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.
1 Most of time, there is not a problem with them at all,such as being cancerous. 2  If you have the type of mole called dysplastic nevi, theres a big chancethat it will have to be moved by surgical means.It is very easy for dermatologist to tell the difference between a mole and wart just by examining itclosely.