Thank you for your query on Healthcare Magic.
Even though your description of child problem is good, but a little bit confusion to know the reason for his one leg swelling which is related to bone marrow
Is it bone or bone marrow?
I advise you to upload the reports and their impressions by using the website uploader, so that it will be easier to advise regarding the swelling.
Nothing to worry as blood work is normal.
Consult the hematologist
as your primary doctor suggested.
Hope I have answered your query.