Combine your choice of herbs with the carrier oil in a tightly sealed container and let it sit for 2–3 weeks. Strain out the herbs. (Note: If you see mold growing, you need to toss it and start again.)
Combine the remaining oil with beeswax in a saucepan or double boiler over low heat until just melted. Let cool slightly before handling.
Pour the mixture into a clean container, add essential oil(s) if desired and let cool completely.
Notes
Store in a lidded container in a cool, dry place. If stored properly, your balm should last for at least a year.