Blood blister

Blood blister
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A blood blister is a type of blister that forms when subdermal tissues and blood vessels are damaged without piercing the skin. Unlike a regular blister, which is filled with a clear fluid called serum, a blood blister contains blood. Blood blisters are typically red or purplish in color and can be painful to the touch.

Causes

Blood blisters are usually caused by a sudden impact or pinching of the skin. Common causes include:

• Trauma: A sudden impact or pressure, such as getting a finger caught in a door.
• Friction: Repeated rubbing or friction, often from poorly fitting shoes.
• Burns: Exposure to heat or chemicals can cause blood blisters.

Symptoms

The primary symptom of a blood blister is a raised area of skin filled with blood. Other symptoms may include:

• Pain or tenderness at the site of the blister.
• Swelling around the blister.
• Redness or discoloration of the skin.

Diagnosis

Blood blisters are usually diagnosed based on their appearance and the patient's history of trauma or friction. In some cases, a healthcare provider may perform a biopsy to rule out other conditions.

Treatment

Most blood blisters heal on their own without medical intervention. Treatment options include:

• Protecting the blister with a bandage or dressing.
• Applying ice to reduce swelling and pain.
• Keeping the area clean to prevent infection.

It is generally advised not to pop a blood blister, as this can increase the risk of infection.

Prevention

To prevent blood blisters, consider the following:

• Wear properly fitting shoes to reduce friction.
• Use protective gear when engaging in activities that may cause trauma.
• Be cautious when handling hot objects or chemicals.

Complications

While most blood blisters heal without complications, potential issues include:

• Infection: If the blister is popped or the skin is broken, bacteria can enter and cause an infection.
• Scarring: In some cases, a scar may form after the blister heals.

Also see

• Blister
• Skin trauma
• Wound healing

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