One of the first distinctions is between the healing itself and the 'power' behind the healing. The act of healing, is readily seen most of the time in this century in healing ministries as well as in others, where an act of healing takes place in a physical way. Acts of healing can also be spiritual or mental, but the process takes place in a transformation between a former state and a new state.
The power behind the healing is implicitly God's, and in Scripture is associated with the breath of God, or the Holy Spirit of God, acting usually through one believer for the benefit of another. We find the word 'morday' for healing which encompasses the process of something being made whole, or restored to a right state, and even in Salvation, we find that one of the Greek words for salvation--- soterion, carries the meaning of health or healing about a third of the time in Scriptures. The power of God which heals, is both used directly as Holy spirit power, or dunamous
and is included in such passages as when the woman with an infirmity touches the hem of Jesus's garment, and is healed. Jesus notes that virture is gone out of Him but the word for virtue is also 'dunamous' in the Greek.
Mar 5:30 And Jesus, immediately knowing in himself that virtue had gone out of him, turned him about in the press, and said, Who touched my clothes?