Waking up with bruises on your arms and no memory of a previous injury can be worrying. These types of marks, which appear for no apparent reason during sleep, often have common causes, although in some cases they can be a sign of a medical condition that requires attention.

Below, we explain why bruises may appear while sleeping and what to do if they occur frequently.

What is a bruise?

A bruise (also called a hematoma) is a collection of blood under the skin caused by the rupture of small blood vessels. It usually appears after a blow, although in some cases it forms without the person noticing.

Common causes of bruises while sleeping

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