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.
Warts tend to be rougher, with a âwartyâ irregular surface whereas skin tags are usually smooth. Warts tend to be flat whereas tags are more like bumps hanging from thin stalk. While warts are almost entirely caused by human papilloma virus (HPV), tags are only sometimes associated with HPV.