The appearance of bruising on the arm after a blood draw is mostly due to insufficient local compression time or compression strength after the blood draw, resulting in the vascular rupture not being contracted in time, which in turn causes local bruising due to blood extravasation. Within 24 hours after the blood is drawn, local bruising can be combined with the application of cold compresses, mostly cold towels or ice, to promote the contraction of the ruptured blood vessels to reduce the extravasation of blood and bruising. If the bruise appears after 24 hours, it can be changed to hot compresses, using warm salt water and towels to promote the dissipation of the bruise, and at the same time can be combined with topical ointment to activate blood stasis and disperse nodules, generally you can choose Furtalin topical, and at the same time with taking Chinese medicine to regulate, pay attention to rest, to avoid excessive activity and other local rupture of the blood vessel bleeding again, and then cause increased bruising.