Aromatherapy massages use essential oils. To increase the effectiveness of the treatment, the oils are combined with carrier oils. It is vital that the therapist use pure, undiluted essential oils for the massage. Fragrance oils are synthetic and do not provide the therapeutic benefits of essential oils. A trained professional should perform an aromatherapy massage to avoid allergic reactions. However, there are some things you should keep in mind before getting an aromatherapy massage.