You can put essential oils onto your skin but you first should dilute the essential oils first using a carrier oil such as olive oil before applying the essential oils to your skin.
If you apply the essential oils directly to your skin then it could cause a rash or burn to your skin because essential oils are pretty powerful.
So as long as you dilute the essential oils first and then apply the essential oils to your skin then you should not have any rashes or burns from it.