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.
The main differences between plantar warts and corns are in location, appearance and number. Planter warts mainly occur on the heel and the ball of the foot or the underside of the big toe. Corns usually occur between and on top of the toes but occasionally they can also appear on the ball and the heel.