Blisters can be various colors depending on their type and cause. A typical blister contains clear fluid and appears translucent or slightly yellowish. However, different types of blisters present different colors.
Types of Blisters and Their Colors
- Clear Blisters: These are the most common type and contain clear fluid. They appear translucent against the skin.
- Blood Blisters (Hematoma): These blisters are filled with blood and appear red, purple, or black, depending on the amount of blood present and how long it has been there. Initially, they may appear a lighter red, darkening over time.
- Infected Blisters: An infected blister will often contain milky-white, green, or yellow pus. The surrounding skin might also appear red, though this can be less noticeable on darker skin tones.
Color Variations Explained
The color of a blister's fluid reflects its contents:
- Clear: Indicates a normal blister with serous fluid (a watery fluid).
- Red, Purple, Black: Shows the presence of blood, indicative of a blood blister resulting from trauma.
- Yellowish, Greenish: Signals a possible infection with pus, indicating the presence of white blood cells fighting off bacteria or other pathogens.
It is important to note that the color of the surrounding skin may also be affected by the blister. For example, an infected blister might cause redness in the surrounding area, regardless of the initial blister color.
When to Seek Medical Attention
If a blister is accompanied by severe pain, significant swelling, or signs of infection (such as increasing redness, pus, or fever), it's crucial to consult a doctor. Likewise, if the blister is unusually large, does not heal, or is caused by a burn or other serious injury, medical attention is necessary.
