Blood normally contains 1,50,000-3,50,000 platelets per cubic mm. But the reduction in their number can lead to various clotting disorders. One of the diseases is Immune thrombocytopenic purpura (ITP). It is a disorder that can lead to excessive bleeding due to the very low count of platelets (20,000-30,000) per cubic mm. ITP is an immune disorder in which the blood doesn't clot normally.