The key difference between a blood blister and a normal blister lies in the fluid that fills the pocket under the skin: a normal blister contains clear fluid, while a blood blister is filled with blood.
Here's a more detailed breakdown:
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Normal Blister:
- Contains a clear, watery fluid called serum.
- Typically caused by friction, burns, or allergic reactions.
- Appearance is usually translucent or slightly yellowish.
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Blood Blister:
- Contains blood.
- Typically caused by trauma or injury that damages blood vessels underneath the skin, like pinching or crushing.
- Appearance is red or black due to the presence of blood.
In summary, the presence of blood distinguishes a blood blister from a regular blister. Both types of blisters are essentially fluid-filled pockets, but the fluid's composition dictates the difference.
