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 vs pimple: Causes, Symptoms, Differentiation. The biggest difference between a genital wart and a pimple are their underlying causes. While these are not visible factors, it helps to know in case you end up having genital warts. The cause of genital warts is a virus known as HPV. Learn about HIV warts at this link.