Lemon Grass is very strong and needs to be diluted with a fatty oil like olive oil or coconut oil, etc. Key properties of the oil are antiviral/bacterial, sedative and anti-inflammatory. It has a heavy aroma and is pretty strong. So use only one drop.
DO NOT use it on broken skin as it could irritate it.

You can mix it with the Tea Tree oil.

I use lemon grass for tendon and ligament issues. But I usually mix it with other oils to make a blend that's more synergistic. I don't think I've ever used alone. It's always in a blend and diluted.