The rash that a person gets from wearing a ring on the finger can be cured by a applying a rash cream like cortisone cream or not wearing the ring when the hands are wet. You can also neutralize the ring in hydroxide peroxide and distilled vinegar solution. Read more details on this at http://www.medicinenet.com/script/main/art.asp?articlekey=107570.
The rash occurs because when you wash your hands, the water gets trapped between the ring and your finger. Either wash or bathe without your ring or after washing or bathing, take your ring off and dry it thoroughly.