Of, pertaining to, or characteristic of ecchymosis
The term ecchymotic is a descriptive word that is associated with ecchymosis. Ecchymosis refers to the effusion of blood underneath the skin. It is caused by a ruptured blood vessel. It is characteristically flat, rounded or irregular, and bluish or purplish in colour. Sometimes ecchymosis is used interchangeably with bruise however the former may not be necessarily caused by trauma. 1 It is also different from petechia. It is larger than petechiae, which are typically 2 millimeters to 1 centimeter in diameter.2
The word ecchymotic is used in the following terms: ecchymotic mask and ecchymotic rash. Ecchymotic mask is a dusky discoloration of the head and the neck. This results when the trunk has been subjected to sudden and extreme compression, such as in traumatic asphyxia. Ecchymotic rash is a purpura that is usually due to a contusion.
Word origin: Greek ek (out) + khéō (I pour)
1 UCSF Purpura Module. Retrieved from http://www.dermatology.ucsf.edu/education_training/140.01ClinicalDermatology/Module.8.Purpura%20Module%20REVISED2.pdf
2 Leung, AKC; Chan, KW (August 2001). "Evaluating the Child with Purpura". American Family Physician 64 (3): 419–429.