I have petechiae

Preteciae occurs when the blood vessels come up to the skin and the vessels bleed under the skin. My arms are the worst affected. But, I have it all over my body. My doctor did a blood test today. She wants what's called a purple smear test. I am very scared because there are so many things this could be. If things turn out abnormal, she is going to send me to a hematologist. Thanks for reading. Just had to get this off my chest.