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.
A wart is typically a small, rough, non-cancerous tumor that grows on the top layer of skin. They often resemble a solid blister or a cauliflower, and can seem either very light or very dark compared to the normal skin surrounding it. They're usually painless, but can cause itching and burning if they are in high-friction areas.