Oils can be added to carriers such as almond, black seed, jojoba, or olive oil. The amount to use is about 1-2 drops per 5 ml. or 8-12 drops per ounce of carrier. For instance, one can put a few drops into an aloe vera gel and use this oil for itchiness associated with jock itch and ringworm. This can vary, but the oils are generally efficacious even when very diluted. Oils can be added to skin lotions, shampoo, and certain gels. In this case, one drop per ounce is usually sufficient.
Some products have been produced with essential oils to spare the learning curve of do-it-yourself efforts.