Probably the most recommended of essential oils for scars is helichrysum.
A simple scar recipe is to combine 10 drops helichrysum with 1 tablespoon rosehip seed oil and 1 tablespoon hazelnut oil. Rub a little of the blend into the scar twice a day.
While recent scars may fade within a few weeks, old scars may require you to apply an essential oil blend two to three times a day for three to six months or longer.
A blend to use for old scars:
Source: Advanced Aromatherapy
The book also notes that rosehip seed oil has triple unsaturated fatty acids that strengthen cell membranes, making it a good carrier oil to use to help fade scars.
Other essential oils that may help scars fade include:
Tamanu Oil Blend
Blend all ingredients in a glass bottle. Use the blend three to five times a day, massaging it into scars, stretch marks, or old injuries.
Aromatherapy For Scars
Blend all ingredients in a dark bottle. Rub a little into the scar several times a day.
Source: Raindrop Messenger
Rosehip Oil Blend
Puncture the vitamin E capsules and drain the oil into a small glass container. Blend in the other oils. Apply a little of the blend to scars two to three times a day.
Another technique that can help, and that you can combine with using essential oils, is cross-fiber friction massage on the scar.
Place your thumb or other finger firmly on the scar and move the scar without sliding your finger on your skin. Use only as much pressure as is comfortable. Learn more about scar tissue massage.
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