When performing a healing on someone the Curandera will often sweep the aura/energy field with sacred herbs and blow smoke on the individual....This can clear the negativity or entities that are causing the ailment.
"Shamanism is the most ancient spiritual practice known to human kind. As a method, it is a form of meditation combined with a focused intention to accomplish various things. As a spiritual practice, shamanism can become a way of life that may utterly transform the one who practices it." - Awakening to the Spirit World, by S. Ingerman and H. Wesselman