Bruising after blood sampling is not large in size and can be left untreated for a few days and will disappear on its own; if the bruise is too large in size, you can apply cold compresses and hot compresses to speed up the absorption of the bruise.
Purple bruise after blood drawing is usually caused by not pressing the needle hole for enough time after blood drawing, or not pressing to the right position, and the blood flows under the skin. If there is no blood clotting disorder or other diseases, if the bruise is not large, it can be left untreated, and the surrounding skin can be kept clean and hygienic, and it will disappear on its own in a few days.
If the bruise area is large and the time is not more than 1 day, can be used ice bag or towel wrapped ice in the bruise, a compress about half an hour, once every two hours, 1 day after the hot compress; such as the appearance of more than 1 day, can be directly for the hot compress.
If there is a coagulation disorder or the bruise does not disappear or even expand, you should consult a doctor in time, depending on the specific circumstances of the specific treatment.