Tea tree oil on a skinned knee?? Not something I would want to try. It will burn like H#$$!!!Or even lavender oil or tea tree oil
Or.......you could put salt and lemon juice on that open wound and see if it feels close to straight tea tree oil!!!You should always dilute an essential oil (like tea tree or lavender) in a carrier oil (like jojoba) before applying or it will cause irritation and tissue damage.
Essential Oils from Mountain Rose Herbs
I would always dilute an EO or at least do a patch test before applying it "neat"!!
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