I think most of routine treatment is received by your son. The treatment to itp is not one time job.. it is maintenance therapy, as and when you see dropping platelet counts you need to give injections. Maybe maintenance oral steroid for 3 mths can be tried.
Next Steps
1. you need to review with pediatrician hematologist once
2. need to review the diagnosis again
3. if the diagnosis is still the same maybe newer modalities or research molecules can be tried like eltrombopag or monoclonal antibodies.
Health Tips
constantly keep watch on signs of bleeding tendencies.