Can you recount the story of the doctor from Malegaon and his nephew as told in the Satcharitra?

Certainly. Chapter 34 narrates the story of a degree-holding doctor from Malegaon whose young nephew was afflicted with a severe bone-cyst, also known as Hadyavarn. The text explains that the doctor himself, along with his physician friends and expert surgeons, tried numerous treatments and even surgery, but all their efforts were exhausted without success. The boy was in great pain. Having heard of the great saint Sai Baba in Shirdi, the boy's parents decided to go there as a last resort. They pleaded with Baba, who, as the embodiment of compassion, reassured them. He gave them Udi and instructed them to apply it to the wound, promising to remove the ailment.