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.
Skin Tags vs. Warts vs. Moles. Difference between Skin Tags, Warts and Moles. Human skin is subject to numerous blemishes and unusual conditions, some of the most common of which are skin tags, warts, and moles. Everyone experiences these conditions some time or another, and they are the subjects of this comparison article.