As it is with any type of health product, there are some precautions that one should take while using essential oils.
The biggest of these would be protecting and maintaining the health of your skin by applying essential oils topically in a safe way. Essential oils are highly concentrated compounds; applying these to your skin in their raw, undiluted form could potentially have harmful effects on your skin. This is why you should always mix your essential oils with a carrier oil before use. This oil mixture is now safe to use on the skin, such as for a relaxing massage.
It is always a good idea to patch-test an oil before using it any further, to avoid any unwanted allergic reactions. To do this, dab a bit of your diluted oil mixture onto the inside of your forearm or your back. If after 48 hours, you do not have any reactions such as redness or irritation, then the oil is safe for you to use.
If you happen to have babies, children, or any pets around the house, make sure to do your research properly on which essential oils are safe to use around them before purchasing, to avoid any unwanted reactions.