Hi Vijay,
Can you tell us more about your nephew? Does he have a history of poor health? How long has he had the rash and what does it look like? How long has he had low platelets? Which chelator does he use and what is his ferritin level? What is his hemoglobin level? Is his spleen enlarged? Does he have other problems like diabetes or hepatitis? Where is he being treated? Does he drink anything containing the artificial sweetener, aspartame? There have been some rare reports of low platelets associated with aspartame use.
Rash is one symptom of low platelets. If this is the case, a corticosteroid such as prednisone may be of help in inhibiting the overactive immune system response that is destroying the platelets.
From
http://www.diagnose-me.com/cond/C271923.htmlTreatment & Prevention
Conventional treatment is often aimed at inhibiting the immune system with corticosteroids such as prednisone. Because the spleen filters the platelet-immune complex it may be necessary to remove it in order to reduce the production of anti-platelet antibodies and slow the clearance of platelets from the system. In some people, however, more platelets are destroyed in the liver than in the spleen and in this case removing the spleen is less likely to result in remission. Note that after the spleen has been removed and the platelet levels elevated, the liver can take over the removal function and the platelet count can drop again.
The acute manifestation can usually be controlled by a course of therapy using steroids to inhibit the immune response for a period of several weeks. Chronic autoimmune thrombocytopenia develops in a small percentage of patients. In that case, steroid therapy eventually fails (due to the side-effects from prolonged administration). Until recently, the main therapy for chronic autoimmune thrombocytopenia has been splenectomy, which is sometimes curative and at the very least reduces the disease severity.
Please don't give up hope. It is important that your nephew is surrounded by people who believe that he can overcome this. If those around him are depressed, it may affect his own will.