Definition

Noun: A blood blister is a type of blister that is filled with blood or a bloody serum, rather than clear fluid. It is typically caused by a sharp pinch, crush, or other injury that damages small blood vessels under the skin without breaking the skin's surface.

Usage

A blood blister forms as a protective cushion for the damaged tissue underneath. It is important not to pop it, as the unbroken skin acts as a natural barrier against infection.

Examples

• Noun:
  • I got a painful blood blister on my finger after slamming it in the car door.
  • The new shoes were so tight they gave me a blood blister on my heel.
  • Doctors advise leaving a blood blister alone to allow it to heal on its own.

Advanced Usage

• Medical Context: In dermatology, a blood blister is distinguished from other types of blisters (like friction or burn blisters) by its sanguineous (bloody) content, indicating deeper trauma.
• Figurative Use: Rarely, the term can be used metaphorically to describe something that looks like or evokes the image of a blood blister.
  • The dark, swollen berry looked like a tiny blood blister on the leaf.

Variants and Related Words

• Blister (n): A small bubble on the skin filled with serum and caused by friction, burning, or other damage. A blood blister is a specific type of blister.
• Hematoma (n): A solid swelling of clotted blood within the tissues, which is a different type of injury involving deeper bleeding.

Synonyms

• Hemorrhagic blister (medical term)
• Sanguineous blister (medical term)

Related Idioms or Phrases

There are no common idioms or phrasal verbs specifically using the term "blood blister."

Noun

1. blister containing blood or bloody serum usually caused by an injury