Who said that rings are for the hands only? You really don't have to think about the possibility that toe rings may make you feel uncomfortable or even hurt your feet. Most of the time the ring is made in a way that fit the zone underneath the pad of the toe, so don't worry. If you already wear a ring on your finger then it will be okay for your foot. You'll even forget that it is there! But as you know it all depends on the shoes you're wearing. You must also try to wear it on different toes. It is alright to wear it on any toe that make you feel comfortable, so don't hesitate to do it.