It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) that a woman came to the Messenger of Allah (peace and blessings be upon him) with her son and said: My son suffers from madness due to which he takes our lunch and dinner and spoils and ruins it. The Messenger of Allah (peace and blessings be upon him) stroked the boy’s chest and prayed, so he vomited and a small (thin) child came out of his stomach and ran away. In another narration, it is mentioned that the boy was cured.