What is another word for blood blister?
Pronunciation: [blˈʌd blˈɪstə] (IPA) 
A blood blister is a type of blister that forms when blood vessels beneath the skin's surface are damaged. There are several synonyms for this condition, including hematoma, ecchymosis, and purpura. Hematomas are larger blood-filled blisters that typically occur after trauma or injury. Ecchymosis refers to the discoloration on the skin caused by blood pooling in the tissue after an injury. Purpura is a relatively uncommon condition characterized by small red or purple spots on the skin. While these conditions may have different causes and presentations, they all involve some degree of bleeding or damage to blood vessels beneath the skin.
