Thanks for using Healthcaremagic,
I am sorry to know she has developed bruises, after giving blood for some tests.
Some time it is difficult to draw blood from infants.
It is due to some blood leaks in subcutaneous tissues, and swelling due to local reaction.
You should not worry it will go away in few days but still you can apply some cold
compress as tolerated and even Heparin ointments
are available to hasten the recovery.
Please take very good care of her.
Dr.Akhilesh Dubey M.D.