I had blood test done, my arm is now black, blue and red?

21 years old, female.
I had blood test 10 days ago, the next day small bruises appeared then it started getting bigger. Even yesterday i noticed a new bruise. Besides the bruises, i have pain in my whole arm, I’m not able to do anything with my right arm. Today i applied gel on the bruises and took pills for the pain (Arnica). But I’m a bit worried… When does it heal? Does it cause any future symptoms?


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