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.
The difference between a mole and a wart is that moles are not contagious, but warts are. A mole, or nevus, is a collection of skin pigment cells. When they are small, they look like small brown dots. When the collection is larger, and slightly deeper, it can cause a raised skin colored bump over it.
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.