Can you narrate the story of the doctor from Malegaon and his nephew's illness?

Certainly. Chapter 34 of the Shri Sai Satcharitra recounts the story of a degree-holding doctor in Malegaon whose young nephew was afflicted with a severe bone-cyst. Despite the uncle being a physician himself and consulting with many expert surgeons, the ailment remained incurable. They exhausted all native and foreign treatments, and even surgery failed. The boy was in constant pain and distress. Hearing of a great saint in Shirdi, Sai Maharaj, who could heal diseases, the family decided to seek his help as a last resort. They believed that if Sai Baba applied his Udi, even this incurable disease could be overcome, prompting their journey to Shirdi.