Here is a recipe from “The Complete Book of Essential Oils & Aromatherapy” by Valerie Ann Worwood that you can try for a leg sprain:

“For overstretching of the ligaments in the legs, use an ice pack 4 times a day for 20 minutes at a time. Afterwards massage with the following:

* Rosemary 10 drops
* Eucalyptus 10 drops
* Peppermint 10 drops

Dilute this mixture in 2 tablespoons of Massage Oil

After 48 hours change to hot compresses, on which you have placed 2 drops each of Rosemary and Lavender. Between treatments Keep the leg wrapped with an elastic bandage and periodically massage the whole of the leg from the ankle to the thigh.”