Based on this chapter, what are the purported healing powers of Sai Baba's Udi?

Chapter 34 of the Shri Sai Satcharitra continues to elaborate on the glory and healing power of Udi. The introduction states that a terrible disease like a bone-cyst, which could not be cured by any other remedy, was completely healed by smearing it with Udi from Sai’s hand. The story of the doctor's nephew serves as a specific illustration of this power. The family heard that if the great Avaliya applied Udi with his own hand, even incurable diseases would perish. This belief is confirmed when Sai Baba himself, as the ultimate remedy, instructs the parents to take the Udi and smear it on their son's wound to remove the ailment.