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, Auto Antibodies
against own platelets cause destruction of platelets. This can happen acutely and chronically. It may come and go. When it comes, you see red dash.
Low platelet cause red spots/purpura
.The purpura indicates bleeding under the skin. This is is clotted blood. Once the blood in the purpura resolves/dissolves it forms black spots and the disappear.
Make sure you repeat the platelets minimum monthly, especially when he gets the severe rash
. Platelets less 20,000 is dangerous and cause intra cranial bleeding.