Answer:
Cabeza de Vaca method of treatment to heal the sick and injured indians who were brought to him was laying-on of hands and fervent praying.
By doing this, Cabeza de Vaca received food in return for treating the ill and injured Indians throughout his mercantile career. His method of treatment included blowing his breath on affected areas of bodies and laying on of his hands, to which the Indians responded positively.
Cabeza de Vaca also practiced surgery according to one historic operation in 1535, where he removed an arrowhead from deep in an Indian's chest (sagittectomy).