Blood Blisters

For most people, blisters are a mild skin condition and a fairly common occurrence. The friction-type blisters you get on your heel from your shoes rubbing up and down are filled with a clear fluid.

Blood blisters, on the other hand, are raised sacs on the skin that contain blood. Smaller blisters may also be called vesicles, while larger blisters may be referred to as bulla. Most of the time, blood blisters will disappear on their own and do not pose any significant health concerns to you.

Here's what you need to know about this mild skin condition, when and how to care for it, and how to prevent blood blisters from forming.

Common Locations

There are a few areas where blood blisters are likely to pop up. They include:

  • Hands
  • Fingers
  • Feet
  • Mouth
  • Areas of the body that are subject to excessive friction
  • Places where the skin has been pinched (like pinching your finger in a door)
  • Close to joints
  • Near bony prominences


You’ll be able to distinguish blood blisters from fluid-filled friction blisters, because the raised area will fill with blood as opposed to a clear liquid. When you have a blood blister, deeper layers of the skin are affected, and the cells above the blister die off.

The skin’s blood vessels sustain some mild damage, often dilating as part of an immune response to the dying cells, and inflammation occurs. Initially, the encapsulated blood is a light shade of red, but the hue will darken with time.

Depending on how you acquired the blood blister, you may experience pain at or around the site, and you may notice that inflammation is present. Additionally, blood blisters may be itchy.


While blood blisters can happen to anyone, they are most common in active people (such as athletes or dancers) and individuals who wear shoes that don’t fit their feet properly. People who have jobs and hobbies that involve manual labor are also at risk of developing blood blisters.

Some of the reasons a person may get blood blisters are as follows:

  • The skin is pinched and doesn’t break open.
  • The skin is exposed to a high amount of friction, such as when walking, lifting weights, or using a tool.
  • Poorly fitted shoes cause excess friction on heels and bony areas of the toes like bunions.
  • Feet are more prone to blistering when they are wet—moisture softens the skin and makes it more susceptible to friction.  
  • Frostbite might lead to blood blisters.
  • People with certain diseases, like kidney failure, may experience blood blisters in the mouth, according to the Indian Journal of Dermatology.
  • People taking certain medications, such as blood-thinners, may be more at risk of developing blood blisters.

If you have an unexplained blood blister in your mouth, see your healthcare provider as soon as possible to rule out more concerning causes.

Oral blisters can be brought on by a range of factors, such as an injury from hot food, dental work, and endoscopy procedures. But they can also occur due to serious diseases like rheumatoid arthritis, diabetes, high blood pressure, and, as previously mentioned, kidney failure.

When to Visit a Healthcare Provider

Often times, the diagnosis of a blood blister is relatively straightforward. For example, you may discover the formation of a blood blister after you’ve experienced a minor trauma to the skin, such as pinching your finger or the repeated rubbing of your big toe against the side of your shoe.

In many cases, you’ll be able to identify the blood blister, and you won’t require medical intervention or a trip to the healthcare provider as long as you leave the blister alone and give it time to heal.

However, if you discover any of the following, a trip to the healthcare provider might be appropriate to ensure proper healing:

  • The pain caused by the blood blister is impeding your ability to do your daily activities.
  • The blood blister has emerged for no known reason.
  • It shows signs of an infection like redness, swelling, and the feeling of being hot to the touch.
  • The blood blister goes away, then proceeds to come back again.
  • You find the blister in an unexpected place, such as your mouth, eyelids, or genital region.
  • You discover the presence of several blood blisters at once without an apparent cause.
  • You have an underlying illness, like diabetes or problems with the circulation, that may make healing more difficult for your body.
  • The blister appears following an allergic reaction, burn, or sunburn.


As mentioned previously, most of the time, the blister will heal on its own as long as you remove the trauma or repetitive movement that initially caused it.

Although you may be tempted to pop the blood blister, experts recommend resisting the urge to do so. The layer of skin that covers the blister helps protect it from infection. Over time—about one to two weeks—the blood blister should dry up on its own.

If your blister causes discomfort, over-the-counter pain relievers like ibuprofen or acetaminophen may be sufficient to ease the pain.


Thankfully, the majority of blood blisters, while they may be a bit of an annoyance for a short period of time, will subside in a few weeks. Although there’s no foolproof way to plan for an accidental finger pinch, there are few things you can do to decrease the likelihood of developing a blood blister by other means.

how to prevent blood blisters

Verywell / Brianna Gilmartin

Follow these tips:

  • Wear gloves if you plan to work with your hands or use tools or other equipment that requires repetitive motion and would cause friction on your skin.
  • Make sure that your shoes fit you properly and that they aren’t causing pressure points on your skin.
  • Wear socks with your shoes.
  • If you notice that some areas of pressure are forming, you may need to protect your skin with adhesive padding or moleskin until you have broken in your shoes.
  • If your feet get sweaty, you may find that placing some powder in your shoes helps to soak up extra moisture.
  • Use lubricants on your feet to reduce friction on your skin.
  • If your shoes continue to cause painful blood blisters, you may need to consider investing in a new pair.

A Word From Verywell

Generally, you can prevent blood blisters from forming if you use properly fitted hand and footwear. If you happen to acquire a blood blister, they’ll typically heal without causing you a lot of trouble.

However, if blood blisters show up in unusual places and you can’t pinpoint a reason, it’s a good idea to make an appointment with your health care provider to rule out other medical conditions.

Frequently Asked Questions

  • Can a blood blister appear in the mouth?

    Yes, blood blisters can appear in the mouth. Oral blisters can be caused by injury, dental work, endoscopy (a medical procedure that examines internal organs), rheumatoid arthritis, diabetes, high blood pressure, and kidney failure.

  • Should you pop a blister?

    No, a blister should not be popped. The skin covering the blister helps protect it, and popping increases the likelihood of infection. Blood blisters often take about one or two weeks to dry up. If they cause pain or discomfort, you can take a pain reliever like ibuprofen to ease these symptoms.

  • How do I treat blisters on feet?

    Dermatologists recommend four ways to treat a blister on the feet.

    1. Cut a hole in padding and place it over the blister for protection.
    2. Cover the blister and padding with a bandage. Avoid making it too tight.
    3. Avoid popping the blister.
    4. Keep the blister clean and covered.
  • Should I drain a blister?

    Though you should avoid popping blisters in general, large and painful blisters may need to be drained to relieve discomfort or pain. This can be done by sterilizing a small needle with rubbing alcohol and gently piercing one edge of the blister to drain fluid. When fluid has been drained, wash the area with soap and water. Afterward, apply petroleum jelly and cover the blister.

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4 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Harvard Health. Frostbite.

  2. Shashikumar B, Reddy RR, Harish M. Oral hemorrhagic blister: an enigma. Indian J Dermatol. 2013;58(5):407. doi:10.4103/0019-5154.117337

  3. Worthing RM, Percy RL, Joslin JD. Prevention of friction blisters in outdoor pursuits: A systematic review. Wilderness Environ Med. 2017;28(2):139-149. doi:10.1016/j.wem.2017.03.007

  4. American Academy of Dermatology Association (AAD). How to prevent and treat blisters.

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