Idiopathic thrombocytopenic purpura (id-ee-oh-PATH-ik throm-bo-sigh-toe-PEE-nik PUR-pu-ruh), or ITP, is a blood-clotting disorder. Idiopathic means the cause is unknown, thrombocytopenia means too few blood platelets and purpura means purple, so called because you may have purple spots (bruises) on your skin. If you don't have enough platelets, your blood can't clot properly and you may have abnormal bruising and bleeding.
Doctors will diagnose your low platelet count as ITP only when they have ruled out other causes. ITP can be short term (acute), especially in children, or long term (chronic). Mild cases may not require treatment.
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