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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Knot On Arm After Drawing Blood?

I have a knot on my arm where a nurse drew blood. one week ago. I It doesn t hurt, and is not soar . I don t think any one could draw blood from that vein again. What should I do. e-mail address YYYY@YYYY
Tue, 1 Aug 2017
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Dentist,  's  Response
Hi..
Thanks for the query..

As per your complain a painless knot at the site of drawing blood from vein seems to be due to Hematoma formation that occurs due to spillage of blood from the blood vessels when the needle is withdrawn and causing accumulation of blood into the soft tissues and it can also cause bruising and there is also hematoma formation..
Hematoma is a harmless tumor like mass formed due to spillage of blood from ruptured blood vessels leading to accumulation of blood into the soft tissues forming a lump..
At times the hematoma gets localised and encapsulated and forms a firm hard lump that can take a long time, say a few months to resolve, but it generally tend to resolve itself..
As of now you should do alternate warm and cool compresses over the lump..
Apply Heparin gel as it help in faster disintegration of the hematoma..

In case if it worsen or shown no signs of improvement in 15 days consult a General Surgeon and get evaluated..


Hope this helps..

Thanks and regards.
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What Causes Knot On Arm After Drawing Blood?

Hi.. Thanks for the query.. As per your complain a painless knot at the site of drawing blood from vein seems to be due to Hematoma formation that occurs due to spillage of blood from the blood vessels when the needle is withdrawn and causing accumulation of blood into the soft tissues and it can also cause bruising and there is also hematoma formation.. Hematoma is a harmless tumor like mass formed due to spillage of blood from ruptured blood vessels leading to accumulation of blood into the soft tissues forming a lump.. At times the hematoma gets localised and encapsulated and forms a firm hard lump that can take a long time, say a few months to resolve, but it generally tend to resolve itself.. As of now you should do alternate warm and cool compresses over the lump.. Apply Heparin gel as it help in faster disintegration of the hematoma.. In case if it worsen or shown no signs of improvement in 15 days consult a General Surgeon and get evaluated.. Hope this helps.. Thanks and regards.