Skin tags on the neck are a type of benign growth, characterized by a small piece of soft hanging skin attached by a narrow stalk. Skin tags are composed of a core of fibers, ducts, nerve cells, fat cells and a covering or epidermis. There are many unrevealed causes for growing skin tags, however the most common reason for skin tags around the neck is skin-on-skin friction. Skin irritation by jewelry and  clothing.