Why Do Cannulas Bruise?

A bruise from an IV typically forms during or after IV treatment

when the punctured vein wall allows blood to enter the skin and pool inside it. After which, the outer layer of the skin absorbs the blood and holds it there – resulting in the discoloration.

Is it normal to bruise after cannula?

When the cannula has been taken out, the place where it has been may feel slightly bruised. This sensation can last for up to one week and is quite normal. The dressing which is put over the site after removal can usually be taken off within a couple of hours.

When do IV bruises go away?

When to see a doctor

According to the World Health Organization (WHO), bruising after a blood draw typically heals quickly. However, if the bruise is large, it may take 2–3 weeks to fade and disappear. A person should call their doctor if they experience any of the following symptoms : the hand becoming discolored.