Skin tags are small, soft pieces of skin that stick out on a thin stem. They most often appear on the neck, armpits, upper trunk, and body folds. The cause of skin tags is not known. They are harmless.
Moles are skin growths made up of cells that produce color (pigment). A mole can appear anywhere on the skin, alone or in groups.
Warts are small, self-limited tumors caused by one of over 100 types of human papillomaviruses (HPV). The clinical forms of warts include common warts, flat warts, plantar warts, periungual warts, filiform warts, and genital warts. Warts typically disappear on their own with time, but it may take years. Warts respond variably to a variety of treatment measures.