Essential Oils for Swelling

I was just speaking with my friend Lynne who was the person who got me started on essential oils. Earlier this week she was getting dressed in a hurry and hit her arm on her moving ceiling fan (she's 6 ft. tall, so this is possible). Immediately, her arm swelled up where it was hit. She immediately put lavender essential oil on the tender area. Within a couple of minutes the swelling had subsided and her arm is fine!