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.
Warts are small growths caused by a viral infection of the skin or mucous membrane. This virus infects the epidermis (surface) layer, and are contagious, easily passing from person to person. Warts can also pass from one body part to another. Common warts are hand warts, foot warts, and flat warts. Hand warts frown around the fingers (specifcally the nails) and on the backs of hands. They appears mostly in areas where the skin may be 'broken'.