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.
Summary: 1.Warts are caused by HPV while corns are caused by pressure on the bony prominences of the skin with direct contact and pressure upon walking or standing. 2.Warts are transmissible and can be transmitted to others when thereâs an open wound or a break in the skin while corns are not.