COMPRESS: Dilute 1 part essential oil (s) with 4 parts vegetable oil and apply 8-10 drops on affected area. Cover with a warm, moist hand towel for 10-15 minutes. Can also use a cool, moist hand towel instead of a hot one, to create a COLD compress.
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Unyquity has explained the use of an herbal fomentation and I agree that fomentation is the best way to apply herbs for topical applications.
I do not see a reason for adding essential oils to the herbal fomentation.