It depends: If you just had your blood drawn, then there is red swelling and pain, then some extra blood might have leaked under the skin. This will go away with time. If it has been a few days since you had your blood drawn, then you might be dealing with an infection, and you need to have your doctor check it out. You can put on some topical antibiotic and a bandaid, and call your doctor.
Answered 9/28/2016
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