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.
Wart facts. 1  Warts are small, self-limited tumors caused by human papillomavirus (HPV) infection. 2  Types of warts include common warts, flat warts, plantar warts, periungual warts, and filiform warts. 3  Warts typically disappear on their own with time, but it may take years. Types of warts include common warts, flat warts, plantar warts, periungual warts, and filiform warts. 2  Warts typically disappear on their own with time, but it may take years. 3  Warts respond variably to a variety of treatment measures.