Itching behind the knee is commonly caused by heat buildup in warm weather, an allergic reaction to soaps and skin care products, or from improper hygiene. However, some remedies can help to solve this problem, along with proper washing, according to Jennie Harding, author of "The Essential Oils Handbook: All the Oils You Will Ever Need for Health, Vitality and Well-Being,” and Susan Worwood, author of "Essential Aromatherapy: A Pocket Guide to Essential Oils and Aromatherapy.”
Combine ½ tsp. white birch essential oil, ½ tsp. carrot seed essential oil, ½ tsp. cabreuva essential oil, ½ tsp. elemi essential oil, ¼ tsp. orange essential oil, ¼ tsp. Roman chamomile essential oil and ¾ cup jojoba oil in a small bottle with a tight fitting top.
Wash your skin with lukewarm water and a gentle cleanser. Pat the area dry with a clean cotton towel after washing.
Pour a small amount of the essential oil mixture onto a clean cotton ball. Gently rub the cotton ball on the skin behind the knee for 15 to 20 seconds.
Leave the essential oil mixture on your skin for 10 to 15 minutes after application.
Wipe your skin with a disposable towel to remove excess oil after the allotted time has passed.
Use this treatment in the evening before bed. Stop using the essential oil mixture if it causes redness, burning or any other irritation.