The discoloration of skin beneath jewelry, specifically rings, is a common phenomenon characterized by a darkening or blackening of the skin. This occurrence is primarily attributed to a chemical reaction between the metal of the ring and substances on the skin, such as sweat, lotions, or other cosmetics. For example, a ring composed of a metal alloy containing copper may react with perspiration, leading to the formation of copper chloride, which presents as a greenish-black residue on the skin.
Understanding the underlying causes of this discoloration is beneficial for maintaining skin health and jewelry integrity. Historically, this issue has been observed across various cultures and periods, often prompting the development of remedies ranging from simple cleaning practices to alterations in jewelry composition. The awareness of potential skin reactions allows individuals to make informed decisions regarding jewelry selection and wear, minimizing unwanted effects.