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.
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.