Gold necklaces do not cause skin tags directly, but they can contribute. Skin tags are usually caused by friction, so when a necklace rubs against the skin, it can cause irritation that leads to skin tags.
Necklaces may also harbour bacteria and other germs that could lead to infection and further inflammation. In addition, necklaces are often made of metals such as copper or nickel, which may cause an allergic reaction in some people.
If you are prone to skin tags or develop them frequently, it is best to avoid wearing gold necklaces and opt for soft materials such as fabric instead. In addition, avoiding tight-fitting jewellery is the best way to prevent skin tags from forming around the neck area.