ec·chy·mo·sis 
(ĕk′ĭ-mōsĭs)
(ĕk′ĭ-mōsĭs)n.
The passage of blood from ruptured blood vessels into subcutaneous tissue, marked by a purple discoloration of the skin.
[New Latin, from Greek ekkhumōsis, extravasation, from ekkhumousthai, to extravasate : ek-, out; see ECTO- + khumos, juice; see gheu- in the Appendix of Indo-European roots.]
ec′chy·motic (-mŏtĭk) adj.