The gospels provide many accounts of Jesus healing the sick, and there are almost as many methods that He used to heal them. His healing a deaf-mute man is unique.
First-century medicine had no answers for the deaf-mute man; he was isolated from society. Christ's healing teaches us valuable spiritual lessons.
In Scripture, foam is usually accompanied by a state of agitation, as in hurricanes, angry waves of the sea, nations being torn asunder, or demonic influence.
When Jesus came down from the Mount of Transfiguration, he faced a tragic situation in the demon possession of a young boy. Martin Collins discusses the boy's affliction in terms of its medical description, intensity, defilement, and deadliness.
Sin causes disease, but the person who becomes sick does not necessarily commit the sin. Because God alone can forgive sin, God alone can heal.