I'm happy that you have asked me to assist you with your child and hope that you can benefit from my many years of helping parents like you.
It sounds like what you are describing it a condition where the platelets are low called idiopathic thrombocytopenia purpura (ITP) where the child has easy bruising and bleeding. If the platelet count was 17,000 then that can be quite serious with even spontaneous bleeding in organs, including the brain. It is treated with either steroids or more commonly with IV immune globulin when severe and that is determined by the hematologist usually.
I see you are offline and I am locked on your other question right now so I'll post an answer there too.
so presently the only symptoms were some bruising, but no bleeding. Seen by one Hematologist who said bring him in to hospital tomorrow. But I don't feel he needs anything currently. I think some observation first, because he has no symptoms, very active, and I believe this might be related to the flu that he had a few weeks back. what do you think?