What Type of Essential Oil Was This?

The other day, I got a mage. During the mage, I got really stuffed up from laying face down. The mage therapist put some sort of essential oil on her hands and held them over my nose for me to breathe in the scent. it cleared up the congestion quickly. Unfortunately, I forgot to ask her what kind of oil it was. If I had to guess, I would say that it was peppermint, but I am not sure.