There are several essential oils that are helpful. First recommendations per my "Essential Oils Pocket Reference" text are: Lavender, myrrh; or Frankincense, elemi, spikenard, geranium.
My suggestion is to get some Lavender essential oil - it is readily available at places like Henry's. You can mix it with a carrier oil (like jojoba, almond, macadamia, etc.) and then apply 2-3 drops twice a day. I would make up a very small amount in a separate little bottle as you would be mixing it 50/50. That way you can save the Lavender oil for other uses in different concentrations later, like adding some to your bath or bath salts.
M. Sexton