Fill a small pot with about 2 inches of water and place it over medium heat. Set a heat-safe glass measuring cup or bowl inside to create a basic double boiler.
Add your herbal oils and beeswax to the top bowl. Warm, stirring every few minutes until the beeswax is completely melted and the mixture looks clear. Keep the heat low and steady, and avoid getting any water into the oils because it can reduce the shelf life of the oil.
Once the wax has melted, carefully remove the bowl from the hear. Stir again to be sure everything is evenly mixed.
Pour the warm salve into clean, dry jars or tins.
Let it cool until solid, then cover with lids and label.