Due to your particular sweat compounds your skins react to the minor copper content in the Sterling silver alloy. This occurrence is relatively rare, happening in approximately 1 out of 50 cases. It is important to note that this reaction is not harmful and is unrelated to the quality of the sterling silver used; rather, it is a natural response to the copper content. If you keep wearing the ring for the next 2 weeks approximately it will leave no more stains on your skin. However, if you remain concerned about this issue, we are happy to accept the ring for a refund.