Is it bad if jewelry makes your skin turn green?

It can be, yes.

When jewelry makes your skin turn green, it is usually because the jewelry is made of copper or brass and has been coated with a thin layer of gold or silver. Over time, the coating can wear off and the copper or brass will come into contact with your skin, causing it to turn green. This is called oxidation.

In some cases, the green discoloration can be harmless. However, in some cases, it can be a sign of a nickel allergy. Nickel is a metal that is often used in jewelry, and some people are allergic to it. If you are allergic to nickel, wearing jewelry that contains nickel can cause your skin to turn green, itch, and swell.

If you are concerned about the green discoloration of your skin, it is best to see a doctor to rule out any underlying medical conditions.