An aural hematoma is a fluid-filled swelling of the rabbit's ear flap, formed when small blood vessels rupture between the skin and cartilage. The cause is almost always self-trauma — head shaking, scratching from ear mites, ear infections, or trauma from a cage-mate. Per AEMV Pet Care Guides, 2024, prompt veterinary evaluation prevents permanent ear deformity and addresses the underlying cause.
Last reviewed: May 2026
What an Aural Hematoma Looks Like
A typical aural hematoma in a rabbit appears as a soft, fluctuant, often warm swelling on the inside of the ear flap (pinna). It can range from a small bubble to involve nearly the entire ear. The ear feels heavy and the rabbit may carry it lower than the other side. The skin overlying the swelling is usually intact but may show scratch marks. Bleeding from inside the ear canal is uncommon unless severe trauma was involved. Hematomas develop over hours to a day or two and tend to enlarge if the underlying head shaking continues.
Why They Form
The space between the skin and cartilage of the ear contains small blood vessels. Persistent vigorous head shaking or scratching — usually from itch — tears these vessels and blood accumulates in the cleft. The most common underlying causes in rabbits are ear mites (Psoroptes cuniculi), bacterial otitis (often from Pasteurella or staph), foreign body in the ear canal, and trauma from a cage-mate. Rabbits with E. cuniculi infection or vestibular disease may shake the head from disorientation and develop a hematoma secondarily.
How Vets Treat It
Treatment has two parts: drain the hematoma and address the underlying cause. Small hematomas may be drained with a needle aspiration in the exam room. Larger or recurrent hematomas usually need surgical incision under sedation, with the inner surface scored to allow scar tissue to form and prevent re-accumulation. Per Quesenberry & Carpenter's exotic textbook (4th edition, 2021), leaving a hematoma untreated typically results in a permanently thickened, deformed "cauliflower ear" that can also harbor chronic infection. The underlying cause must be treated simultaneously — mite treatment with ivermectin or selamectin, ear canal cleaning, and oral antibiotics for documented bacterial infection.
Pain Control and Why It Matters
Rabbits show pain subtly and a painful rabbit will often stop eating, which triggers GI stasis — a life-threatening emergency. NSAIDs such as meloxicam are routinely used after hematoma drainage. Owners should monitor appetite, fecal output, and water intake closely for 5 to 7 days after any rabbit procedure. Any decrease should prompt a same-day vet call.
When to See a Vet
Call your vet today if:
- A new soft swelling of the ear flap
- Persistent head shaking or ear scratching
- Visible scratch marks or scabs on or around the ear
- Crusty, flaky, or thick brown debris in the ear canal (suggests mites)
- Decreased appetite or fecal output (rabbit emergency in any context)
Go to the ER immediately if:
- A rabbit who has stopped eating for more than 12 hours
- Sudden head tilt with the ear swelling
- Bloody discharge from the ear canal
- Severe weakness, collapse, or labored breathing
- Open, bleeding wound on or around the ear that will not stop with gentle pressure
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Frequently Asked Questions
How much does aural hematoma treatment cost?
Diagnostic exam plus ear cytology and mite check at an exotic-experienced vet runs $100 to $250. Needle aspiration in the exam room is $50 to $150. Surgical drainage with sedation, S-shaped incision, and quilting sutures typically runs $300 to $800. Treatment of mites or bacterial otitis adds $30 to $100. Recheck visits are $50 to $100 each.
Will the ear go back to normal?
If treated early and the underlying cause is addressed, the ear often returns close to normal, though some thickening may persist. Untreated hematomas almost always heal with permanent deformity — a thickened, wrinkled "cauliflower" shape that can be cosmetic only, but sometimes traps moisture or debris and predisposes to chronic infection.
Are ear mites contagious to other rabbits?
Yes. Psoroptes cuniculi mites are highly contagious between rabbits via direct contact or shared bedding. If you have multiple rabbits, all should be treated simultaneously, and the housing thoroughly cleaned. Mites do not infest dogs, cats, or people.
Can I just drain it at home?
No. Home drainage with a needle or scalpel risks introducing infection, damaging the ear cartilage, and missing the underlying cause. Even if you remove the fluid, it will refill within hours unless the cleft is treated surgically and the inciting itch or pain is controlled.
How can I prevent recurrence?
Identify and treat the trigger — usually mites or ear infection. Maintain regular ear inspections (weekly), keep housing clean, quarantine new rabbits before introducing them to others, and address any new head shaking or scratching promptly. Rabbits with vestibular disease (E. cuniculi, otitis interna) may need long-term management to prevent repeated hematomas.
Still Not Sure if Your Rabbit Needs a Vet?
When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of the swollen ear flap from both sides and any visible scratch marks or discharge, or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.