Peppermint is a “hot” oil, which means it creates a warming sensation on the skin when it’s applied undiluted.
We recommend starting out using Peppermint diluted 1:4 with a carrier oil.
If you want to use it undiluted, do a patch test of 1 drop to see how it feels on your skin. If you experience a reaction to the oil, dilute the oil with a 1:4 ratio of carrier oil and try another patch test.