Hi Joy! A double infused lemon balm oil sounds wonderful! You could also make a salve or ointment with it. The benefits of the oil is that lemon balm is a great anti-viral that can help fight cold sores and other ailments in the herpes family (chicken pox, shingles, etc). Some people theorize that the benefits of herbs do make it through the soap making process, some people don’t think they do. (After trying various soaps with and without herbs, I do think they add something extra to soap.) However, while lemon balm soap might (or might not?) be extra helpful for someone with shingles or who suffers from herpes outbreaks, I made it purely as a creative outlet and as a way to turn some of my excess lemon balm into something fun and useful.