Can you share a story about how Sai Baba's Udi was used for healing?

Certainly. Chapter 34 of the Shri Sai Satcharitra narrates a powerful story about the healing glory of Udi. It tells of a doctor from Malegaon whose nephew suffered from a terrible bone-cyst, also known as Hadyavran. Despite the uncle being a physician and consulting with many expert surgeons, all medical treatments, including surgery, failed to provide relief. The family, having exhausted all remedies, heard about the great saint Sai Baba. They traveled to Shirdi and pleaded with Baba to save their child. As described in Chapter 34, the compassionate Sai Baba reassured them, gave them Udi, and instructed them to smear it on the wound. This simple application completely uprooted the pain and cured the incurable disease, showcasing the divine power of the Udi.