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.
Skin tags and moles are both skin growths, but skin tags are always benign and moles sometimes precede the development of melanoma. Generally, these growths are not treated unless there is a pressing reason to do so, such as aesthetic concerns or worries that a growth has become cancerous. Perhaps the key visible difference is that skin tags tend to protrude, while moles are flatter, with a raised surface area. In the case of skin tags, the growth consists of a benign tumor, usually close to the patient's natural skin color, developing in the form of a flap.