10 Causes of Purpura
Cause #7: Blood Transfusions
There is a condition known as post-transfusion purpura. This is a very uncommon, delayed reaction to a blood transfusion, usually occurring between 7 - 10 days after the transfusion. It’s not uncommon to bleed from your mucous membranes or anywhere in your digestive or urinary tract in addition to underneath the skin.
This condition is rarely fatal, but the problem can last for several weeks. People who develop this problem usually have a history of sensitization, often from pregnancy or previous transfusions.
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