Yesterday, your dog's ears looked perfectly normal.

Today, one ear flap looks swollen, thick, and almost like a little water balloon.

Maybe you've noticed your dog shaking their head repeatedly.

Perhaps they've been scratching at their ears for several days.

Or your cat suddenly has a puffy, misshapen ear that feels warm and uncomfortable.

Your first thought might be:

“Did something bite my pet?”

Or:

“Can I just drain that swelling?”

What you're seeing may be an aural hematoma, sometimes called an ear hematoma.

An aural hematoma occurs when blood collects within the ear flap, causing swelling that can range from a small pocket to an enlarged, balloon-like ear.

While the swelling itself is concerning, there's something equally important I want pet owners to understand:

An aural hematoma is often the result of another problem—not the original problem itself.

Ear infections, allergies, parasites, and other sources of irritation can trigger the head shaking or scratching that leads to the hematoma.

And if we treat only the swollen ear without addressing why it happened, the problem may return.

Let's look at what causes aural hematomas, why draining them isn't always simple, what happens without treatment, and how we can help prevent another episode.
​

Your pet's ear flap is called the pinna.

It contains cartilage covered by skin, with small blood vessels supplying the tissues.

When those blood vessels become damaged, blood can accumulate within the tissues of the ear flap.

This creates a pocket of swelling.

An aural hematoma may feel:

The swelling may affect only a small portion of the ear or involve most of the ear flap.

Aural hematomas occur in both dogs and cats, although they're more commonly seen in dogs.

They're not usually a life-threatening emergency on their own, but they can be painful and should receive timely veterinary attention.
​

The most common underlying mechanism is repeated trauma to the ear flap.

Here's how it often happens:

The original irritation may continue, causing even more shaking and scratching.

This creates a frustrating cycle.

Ear Infections

Ear infections are among the most common contributing problems.

Inflammation from bacteria, yeast, or both can make the ear canal extremely uncomfortable.

Your pet may respond by vigorously shaking their head or scratching.

The resulting trauma can cause a hematoma.

Allergies

Dogs with environmental or food allergies may experience recurring ear inflammation.

Even when an obvious infection isn't present, allergic irritation can cause enough scratching and head shaking to injure the ear flap.

This is why some dogs experience repeated ear problems throughout their lives.

Ear Mites and Other Parasites

Ear mites can cause intense itching, particularly in cats and younger animals.

The resulting scratching may contribute to hematoma formation.

Foreign Objects

Grass awns, plant material, or other foreign objects inside the ear canal can cause sudden irritation and vigorous head shaking.

Physical Trauma

Bite wounds, rough play, accidents, and other injuries can also damage blood vessels in the ear flap.

Less Common Medical Conditions

Occasionally, underlying bleeding disorders or other medical problems may contribute to hematoma formation.

Your veterinarian may investigate these possibilities when the history or examination suggests something unusual.

The important takeaway: We need to identify what caused the ear trauma, not simply remove the accumulated blood.
​

Common signs include:

If an ear infection is also present, you may notice:

Sometimes the hematoma develops surprisingly quickly.

An ear that looked normal in the morning may be noticeably swollen by evening.
​

Yes, it can be.

Imagine having a pocket of blood stretching the tissues of your ear.

Now imagine continuing to shake your head while that area is swollen and inflamed.

The pressure and inflammation can create considerable discomfort.

Some pets tolerate the swelling better than others, but an animal that isn't crying can still be experiencing pain.

A swollen ear flap should never be dismissed simply because your pet is still eating, playing, or acting relatively normal.
​

Many aural hematomas can be recognized through physical examination.

Your veterinarian will evaluate:​

In some cases, a small fluid sample may help confirm the diagnosis.

Why an Ear Examination Matters

An otoscopic examination allows the veterinarian to evaluate the ear canal when the pet can tolerate it.

Ear cytology may be performed to identify yeast, bacteria, or other abnormalities.

If infections are recurrent or difficult to treat, additional diagnostics may be needed.

The goal is to answer two separate questions:

1. How should we treat the hematoma?

2. Why did the hematoma happen?

Both answers matter.
​

There isn't one treatment that's appropriate for every pet.

The veterinarian considers:

Treatment options may include needle drainage, medication, drainage devices, surgery, or carefully selected conservative management.

Each has advantages and limitations.
​

One treatment approach is needle aspiration.

The veterinarian uses a sterile needle and syringe to remove accumulated fluid.

This can reduce swelling and pressure.

It may be considered for certain smaller or relatively recent hematomas.

Why Doesn't Draining It Once Always Fix It?

Because removing the blood doesn't necessarily eliminate the space where it collected.

Imagine draining a water balloon without closing the space inside it.

The fluid is gone temporarily, but the pocket remains.

Additional blood or inflammatory fluid can accumulate again.

That's why a hematoma may refill after aspiration.

Some pets require repeated drainage.

In selected cases, veterinarians may combine aspiration with prescribed anti-inflammatory medication or a corticosteroid placed into the hematoma cavity.

These approaches can be useful for appropriately selected patients, but they don't guarantee permanent resolution.

Needle drainage may relieve the swelling without fully correcting the reason it developed or preventing it from returning.
​​

This is one of the questions I particularly want owners to understand.

You may look at the swollen ear and think:

“It's just fluid. Why does my pet need sedation?”

The answer is that the ear is often painful, and the procedure requires precise handling of delicate tissues.

Several factors influence the decision.

1. The Ear Is Already Painful

Placing a needle into swollen, inflamed tissue can be uncomfortable.

A pet may react suddenly even if they're normally gentle and cooperative.

2. The Ear Contains Blood Vessels and Delicate Structures

The veterinarian needs to position the needle carefully.

Sudden head movement can increase the risk of tissue injury or bleeding.

3. Pets Naturally Shake Their Heads

A dog or cat may instinctively pull away, scratch, or shake when the ear is manipulated.

Remaining still is important.

4. Additional Ear Treatment May Be Needed

The veterinarian may also need to examine, sample, clean, or treat a painful ear canal.

Sedation can allow these procedures to be completed more comfortably.

5. Some Pets Are Frightened or Difficult to Restrain Safely

Sedation can reduce fear, movement, and the need for forceful restraint.

But sedation is not required for every needle aspiration.

Some calm pets with smaller hematomas can be treated without it, sometimes with local pain control.

Others benefit from sedation because of their discomfort, temperament, or the procedure involved.

The veterinarian makes that decision based on the individual patient.
​

No.

With sedation, a pet becomes calmer and less responsive, but the depth of sedation varies.

With general anesthesia, the pet is unconscious, and the veterinary team manages and monitors anesthesia throughout the procedure.

Some surgical techniques may require general anesthesia or deep sedation combined with appropriate pain control.

Your veterinarian will consider the safest and most effective approach.

Age alone does not automatically rule out anesthesia.

Instead, the veterinary team evaluates factors such as:

Monitoring and pain management are important parts of the plan.

Surgery is commonly recommended for larger, persistent, or recurrent hematomas.

The goal isn't simply to drain the blood.

It's also to reduce the space where fluid can collect again.

What Happens During Surgery?

The exact technique varies, but the general approach often involves:

Some veterinarians use an incision that remains open temporarily to allow fluid to escape.

Others may use specialized drains or alternative surgical techniques.

Why Are There So Many Stitches?

Owners are sometimes surprised when they see the ear after surgery.

There may be multiple sutures arranged across the ear flap.

Those stitches aren't simply closing a wound.

They're helping hold the tissues together so that the pocket where blood accumulated doesn't readily reopen.

This is an important part of reducing recurrence.

Does Surgery Guarantee the Ear Will Look Normal?

Not necessarily.

Early treatment often improves the chance of preserving a more natural ear shape.

However, some thickening, wrinkling, or scarring may still occur.

The longer the hematoma has been present, the more likely permanent tissue changes may already have developed.
​

Some veterinarians use drainage devices to help fluid escape while the ear heals.

Depending on the technique, this may involve:

The purpose is to prevent repeated fluid accumulation while encouraging the tissues to heal together.

These techniques still require careful monitoring and follow-up.

A drain is not something owners should attempt to place or adjust themselves.
​

Certain hematomas may be managed medically using veterinarian-prescribed anti-inflammatory treatment, sometimes combined with aspiration.

This approach may be considered when:​

However, medical management may require more time and follow-up.

The hematoma may refill or fail to resolve adequately.

The risks and benefits should be discussed for the individual patient.
​

This is where I want owners to understand the difference between eventually resolving and healing well.

Some hematomas can gradually be reabsorbed by the body.

But that doesn't mean the ear necessarily returns to normal.

As the blood and fluid are reabsorbed, inflammation and scar tissue may develop.

The ear flap can become:​

This is sometimes called cauliflower ear.

What Is Cauliflower Ear?

Cauliflower ear occurs when healing and scar-tissue contraction permanently alter the ear flap's shape.

Instead of remaining smooth and flexible, the ear may become irregular and crumpled.

This can be a cosmetic change, but severe deformity may also affect access to or ventilation of the ear canal.

Can the Ear Become Permanently Damaged?

Yes.

Chronic swelling and scarring may permanently change the ear's structure.

Rarely, more serious tissue complications can occur.

And if the underlying ear disease remains untreated, the pet may continue experiencing itching, pain, and infection.

Can a Small Hematoma Be Left Alone?

In selected cases, a veterinarian may recommend observation or conservative management.

That decision depends on the size, discomfort, overall health, and other findings.

But watchful waiting should be a veterinary decision—not a home assumption that the swelling will disappear harmlessly.
​

Yes.

Recurrence is possible, particularly when the original cause of head shaking or scratching remains unresolved.

For example:

A dog develops an ear infection.

The dog shakes their head repeatedly.

A hematoma develops.

The hematoma is drained.

But the ear infection is still present.

The dog continues shaking.

The hematoma may refill or another one may develop.

This is why treating the underlying ear condition is so important.

Recurrence can also occur because the tissue pocket hasn't adequately closed or the ear experiences additional trauma during healing.

Appropriate surgery or medical management can reduce recurrence risk, but no method guarantees that another hematoma will never develop.
​

Recovery depends on the treatment method.

A simple aspiration may involve relatively little wound care but require repeat examinations.

Surgical treatment usually involves a more structured healing period.

Many pets require follow-up over approximately two to four weeks, although some need longer.

The First Few Days

Your pet may have:

Follow your veterinarian's instructions carefully.

Some drainage may be expected with certain techniques, but increasing discharge, foul odor, severe pain, or worsening swelling should prompt a call.

Why Is an Elizabethan Collar Important?

Your pet may still want to scratch the ear while it heals.

An Elizabethan collar helps prevent scratching that could:​

Even when the ear looks better, the tissues may not be fully healed.

Why Are Bandages Sometimes Used?

A properly applied bandage can help:​

However, ear and head bandages must be applied correctly.

A bandage that's too tight, slips, becomes wet, or causes pressure can create complications.

Do not apply a tight homemade head wrap or attempt to reposition a surgical bandage without veterinary instructions.

When Are Sutures Removed?

Depending on the surgical technique, sutures may remain for approximately two to three weeks or longer.

Some techniques use absorbable material.

Your veterinarian will determine the appropriate timing.
​

Your role during recovery matters.

Give Medications Exactly as Prescribed

Pain medication and treatment for underlying ear disease should be administered according to your veterinarian's directions.

Do not discontinue medication early without discussing it with the veterinary team.

Prevent Scratching

Keep the protective collar on for the recommended period.

Protect the Ear

Avoid rough play or activities likely to cause additional trauma.

Keep the Surgical Area Clean and Dry

Follow the veterinarian's specific instructions for cleaning and bandage care.

Do not apply peroxide, alcohol, ointments, or ear-cleaning products to the surgical site unless directed.

Watch for Reaccumulation

Contact your veterinarian if the ear begins swelling again.

Attend Recheck Appointments

Follow-up visits help determine whether:

Complete Treatment for the Original Ear Problem

This may be the most important step in preventing another hematoma.

If allergies, infection, or parasites started the problem, they still need to be managed.
​

No. Please don't attempt this.

I understand why the idea may be tempting.

The swelling looks like a fluid-filled pocket, and it may seem as though removing the fluid would solve the problem.

But attempting to puncture or drain your pet's ear at home can cause:​

The procedure requires appropriate examination, sterile technique, pain management, and a plan for preventing recurrence.

Never attempt to lance, puncture, squeeze, or drain a swollen ear flap yourself.
​

Not every hematoma is preventable.

Accidents and unexpected injuries happen.

But many cases are associated with conditions that cause persistent ear irritation.

Recognizing those problems early can reduce risk.

1. Address Head Shaking Early

Occasional head shaking can happen.

But frequent or vigorous shaking is not something I want owners to ignore.

If your pet repeatedly shakes their head, have the ears evaluated.

2. Treat Ear Infections Promptly

Ear infections can become extremely uncomfortable.

Don't wait until your pet is scratching constantly or the ear smells strongly.

Early treatment may help prevent additional trauma.

3. Manage Allergies

If your dog experiences recurring ear infections, ask whether allergies may be contributing.

Long-term allergy management can be an important part of reducing recurrent ear inflammation.

4. Use Appropriate Parasite Prevention

Your veterinarian can help identify and manage ear mites and other parasites.

5. Clean Ears Only When Appropriate

Not every dog or cat needs routine ear cleaning.

Some pets benefit from veterinarian-recommended maintenance.

Others may develop irritation from unnecessary or excessive cleaning.

Avoid:

And remember: a painful ear should be examined before you attempt to clean it.

6. Watch for Recurring Patterns

Does your dog develop ear irritation during certain seasons?

After swimming?

During allergy flare-ups?

Recognizing patterns can help your veterinary team develop a prevention plan.
​

The basic condition is similar in cats and dogs.

However, ear mites, ear infections, trauma, and other causes of irritation may be particularly important considerations in cats.

Cats may also hide discomfort.

A cat with an aural hematoma may not cry or visibly react until the ear is handled.

Pay attention to:

And just as with dogs, treatment should address both the hematoma and the underlying cause.
​

MYTH: “It's Just a Swollen Ear. It Doesn't Hurt.”

FACT: Aural hematomas can be painful because of tissue stretching, pressure, and inflammation.

MYTH: “Draining It Once Will Fix Everything.”

FACT: The fluid can return if the tissue pocket remains open or the underlying irritation continues.

MYTH: “Sedation Is Unnecessary for Such a Small Procedure.”

FACT: Some pets can undergo aspiration without sedation, but others need sedation for comfort, safety, and precise treatment.

MYTH: “Surgery Is Just for Appearance.”

FACT: Surgery can help relieve discomfort, drain accumulated fluid, reduce reaccumulation, and preserve ear structure.

MYTH: “If I Ignore It, the Ear Will Go Back to Normal.”

FACT: Some hematomas are reabsorbed, but permanent thickening or cauliflower-ear deformity may result.

MYTH: “Once the Swelling Is Gone, We're Finished.”

FACT: Ear infections, allergies, parasites, and other causes still need to be addressed.

MYTH: “I Can Drain It at Home.”

FACT: Home drainage risks pain, infection, bleeding, and additional injury.
​

Arrange a veterinary appointment promptly if you notice:

Ideally, a new hematoma should be evaluated within a day or so, rather than waiting weeks for it to become chronic.

Seek more urgent care if your pet develops:

These signs may indicate a more complicated problem requiring prompt attention.

When a dog or cat presents with an aural hematoma, it's tempting to focus entirely on the swollen ear.

After all, that's what the owner sees.

But from a veterinary perspective, I want us to think one step further.

Why was this pet shaking their head?

Was it an ear infection?

Allergic inflammation?

Ear mites?

A foreign object?

Trauma?

Because even the most technically successful drainage procedure doesn't eliminate a pet's allergies or cure an untreated ear infection.

Successful long-term management involves two goals:

Relieve the current problem.

Reduce the chance of the next one.

That's why ear cytology, appropriate infection treatment, allergy management, and follow-up examinations can be just as important as the hematoma procedure itself.
​

Aural hematomas are one of those conditions that can look dramatic almost overnight.

A perfectly normal ear suddenly becomes swollen, thick, and uncomfortable.

And naturally, owners want the swelling gone as quickly as possible.

But I want you to remember that the swollen ear is often the consequence of another problem.

If we simply remove the blood and ignore the itching or infection that started everything, we may find ourselves treating the same problem again.

That's why I encourage owners to pay attention to the earlier warning signs.

The head shaking.

The scratching.

The odor.

The redness.

The discomfort when you touch the ear.

Those small signs can give us an opportunity to intervene before the ear becomes injured.

And if your pet already has a hematoma, don't panic.

There are several treatment options, and your veterinarian can help determine the most appropriate approach.

The goal isn't just to make the ear look better.

It's to relieve pain, support proper healing, protect the ear's structure, and address the condition that caused the problem in the first place.
​

Aural hematomas are blood-filled swellings of the ear flap that commonly develop after repeated head shaking or scratching.

Remember:

Early treatment of ear irritation may help prevent hematoma formation.
​
​

If this article helped you feel more informed or supported, I’d love to stay connected.

Subscribe to the free weekly PetLovers United newsletter for veterinarian-led education, practical tips, and real-life insights that help you care for the pets you love.

👉 https://www.petlovers-united.com/newsletter

And if you want deeper guidance, tools, and direct support:

Explore the PetLovers United membership, where we help you recognize problems earlier, ask better questions, and confidently care for your pet at every stage of life.

👉 https://www.petlovers-united.com/membership-comparison