A sore formation is a common occurrence after accidental cheek biting, but what if you wake up with a blood filled blister in your mouth the other day? What to do? Well, not panicking is the first thing on the list for sure. Do not fret if your blisters or sores on the roof of your mouth or anywhere else are filled with blood; read this blog to know how to handle them efficiently.

A red blood blister in the mouth looks scary primarily and is more common than you think; it is not a comfortable situation, is visually bizarre, and results in pain. This happens mainly because of soft tissue damage, but it may be something else, like an infection if this issue is recurrent. Let’s have a closer look at this situation:

Blood Blister Inside The Mouth

Blood filled blister is a round-shaped bump growing inside the mouth. These blisters show up when the vessels under your skin-pop and collect the clots under it.

Oral Blood Blisters – Causes

  1. Mouth injury due to accidental or deliberate cheek biting
  2. Anxiety troubles
  3. Allergies
  4. Angina bullosa hemorrhagica – ABH
  5. Having braces
  6. Improper or ill-fitted dentures

Blood Blister in Mouth – Angina bullosa hemorrhagica (ABH)

ABH is a disorder that presents itself with a dark purple sort of blister filled with blood inside the mouth. They shall appear at any time and stay for the next few days before popping. The healing stage is quick after the rupturing stage; fortunately, they heal and do not leave a scar.

Causes For ABH

  • Iron deficiency
  • Deficiency of Vitamin B12
  • Celiac disease
  • Herpes
  • Arthritis
  • Skin rash
  • Allergies
  • Hormone disturbances
  • NSAIDs or steroids
  • Toothpaste
  • Smoking cigarette
  • Eating hard food
  • Local anesthesia
  • Diabetes
  • Dental procedure

Treatment Plan

A blood blister in the mouth does not need external help because it shrinks or bursts itself. Premature popping should be avoided as it may result in a vulnerable lesion prone to bacterial hit. Ensure not to use any alcohol-based mouthwash. Ice, along with over-the-counter pain medications, work well for managing discomfort.

Are Mouth Sores And Blood Blisters Different?

Blood blisters, canker sores, and fever blisters all appear inside the oral cavity. They are \similar but not entirely the same; some of the differences are mentioned:

  • Canker sores are red ulcer-like with a whitish or yellow thin lining. On the other hand, blood blisters in the mouth look dark blue or purple.
  • Fever blisters are detectable before coming via a tingling sensation, and later that same area forms a blister. While a blood blister randomly appears in the mouth.

Managing blood blisters is easy with the following remedies:

  1. Apply ice
  2. Put cucumber for swelling reduction.
  3. Witch hazel cream works well for reducing pain in dry oral blisters.
  4. Chamomile tea helps ease mouth sores.


If the blisters are recurrent or do not pop after a week or max 2 weeks, see your doctor or dentist immediately. Our dentists in Hermosa Dental are here for you. Call E. Little York (713) 695-3400 Highway 6 (832) 427-1797 Porter (281) 747-7004 Tomball (832) 328-5651 for scheduling an appointment.

Skip to content