What does ecchymosis mean?
An ecchymosis is a discolored patch of skin or mucous membrane produced when blood leaks from damaged capillaries into the surrounding tissue — in plain language, a bruise, particularly a large or flat one. The discoloration shifts through blue, purple, green, and yellow as the trapped blood breaks down and is reabsorbed by the body over days to weeks. The term belongs chiefly to medical vocabulary, where clinicians use it with precision: an ecchymosis is larger than petechiae (pinpoint red dots) and flatter than a hematoma (a raised pocket of blood). It appears frequently in clinical documentation of trauma, surgery, anticoagulant therapy, and bleeding disorders, and its distribution can carry diagnostic weight — for example, periorbital ecchymosis after head injury. Derived from Greek roots meaning a 'pouring out of juice', it entered English medical usage in the early modern period. For general readers, 'bruise' remains the everyday equivalent.
nounThe escape of blood from ruptured small vessels into surrounding tissue, producing a discolored patch on the skin or mucous membrane; a bruise, especially one that is large or flat rather than raised.
- Medicine: a flat, discolored patch of skin or mucous membrane caused by blood escaping from ruptured capillaries into the surrounding tissue; a bruise.
"The physician noted a spreading ecchymosis along the patient's forearm where the IV had been placed."
"Elderly patients on anticoagulants often develop extensive ecchymoses after only minor bumps."
"Raccoon eyes — bilateral periorbital ecchymosis — can be a telltale sign of a basilar skull fracture."
Standard plural follows the Greek-style -is → -es pattern, pronounced /ˌɛkɪˈmoʊsiːz/.
"Multiple ecchymoses were documented across the patient's arms and legs."
A 'bruise' sounds ordinary, but doctors reach for the Greek-derived word 'ecchymosis' — literally a case of blood 'pouring out' into tissue — because precision about skin discoloration can signal everything from trauma to serious clotting disorders.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ecchymosis
Ecchymosis derives from Greek 'ekchymōsis', formed from 'ek-' ('out of') and 'chymos' ('juice' or 'fluid'), literally meaning a pouring out of bodily fluid into the tissues. It passed through Late Latin and entered English medical terminology in the early seventeenth century. The same Greek root 'chym-' appears in words such as 'chyme' (partly digested food) and 'parenchyma' (functional tissue), reflecting ancient ideas about the body's fluids.
Related word forms
How ecchymosis is actually used
Strictly clinical in register, appearing almost exclusively in medical writing and speech; in everyday conversation 'bruise' is used instead. The plural is 'ecchymoses'. Clinicians distinguish it from petechiae (pinpoint spots) and purpura (intermediate-sized lesions) by size.
Easily confused with ecchymosis
Petechiae are tiny pinpoint spots of bleeding under the skin, while an ecchymosis is a larger, flat area of discoloration such as a bruise.
A hematoma is a palpable swelling or collection of clotted blood within tissue, whereas an ecchymosis is a flat, non-raised discoloration of the skin.