A green discoloration can appear on skin after wearing certain jewelry or coming into contact with particular metal objects. This mark, often a greenish hue, is common on fingers from rings, wrists from bracelets, or around the neck from necklaces. This temporary staining results from a chemical interaction between the metal and your skin.
The Metal Behind the Green Mark
Copper is the metal primarily responsible for green skin marks. While pure copper can cause discoloration, it’s more often linked to copper alloys. These alloys mix copper with other metals to enhance properties like hardness or durability. Common examples include brass (copper and zinc) and bronze (copper and tin).
Jewelry like rings, bracelets, and costume accessories often contain copper or its alloys. Even gold jewelry below 24 karats and sterling silver (92.5% silver, 7.5% other metals, often copper) can cause this effect. The higher the copper content, the more likely a green mark will appear.
Why the Mark Appears Green
The green mark results from oxidation, a chemical process. This reaction happens when copper contacts oxygen in the air, moisture from sweat, or acids from skin/lotions. Copper atoms lose electrons, forming new green compounds like copper carbonate, often called “patina.”
This green patina resembles the color on old copper roofs or statues, like the Statue of Liberty, which developed its hue from natural oxidation. The thin layer of green compound can then rub onto the skin, creating the visible mark. Factors like body chemistry (sweat pH and acidity), diet, and environmental humidity influence the reaction’s speed and intensity.
Addressing Green Marks on Skin
Green marks from metals are generally harmless, indicating neither toxicity nor an allergic reaction. This natural chemical process differs from a metal allergy, which causes itching, redness, or inflammation. The discoloration is temporary and washes off with soap and water.
To prevent marks, create a barrier between the metal and skin. Apply clear nail polish or a jewelry sealant to parts of the jewelry touching skin. Keeping skin dry and removing jewelry before sweating activities (exercise, showering) reduces discoloration, as moisture accelerates oxidation. Allow lotions and perfumes to fully absorb before wearing jewelry, as their ingredients can interact with metals.
If a green mark appears, remove it with warm water and mild soap. Gently scrubbing the area with a soft cloth or brush helps lift the stain. For stubborn marks, makeup remover or rubbing alcohol on a cotton pad can be effective, followed by rinsing and moisturizing.