As a dog owner, it’s not uncommon to discover a lump or bump on your furry friend’s body. While these growths can be alarming, it’s important not to panic. In many cases, these lumps are benign and pose no serious threat to your dog’s health. However, it’s crucial to have any unusual growths evaluated by a veterinarian to determine their nature and whether they require treatment.
In this comprehensive guide, we will explore the different types of cysts that can affect dogs, their causes, symptoms, and treatment options. We will also discuss when to seek veterinary attention and how to differentiate between benign and malignant growths. By understanding more about cysts, you’ll be better equipped to monitor your dog’s health and provide them with the care they need.
What Are Cysts and What Causes Them?
Cysts are hollow spaces that develop within the body, often filled with fluid, semi-fluid, or solid material. These sacs can form in various tissues and organs, but they are most commonly found on or just beneath the skin. While the majority of cysts are benign, some can grow and cause complications. The contents of cysts can range from natural secretions produced by the body to atypical substances like keratin (a skin protein) or dead cells.
The development of cysts in dogs can be influenced by several factors, including genetic predisposition, certain breeds being more prone to cyst formation, as well as external triggers such as injuries, pressure points, infections, certain diseases, medications, and idiosyncratic injection reactions. Some breeds, like terriers, Chinese Crested, Basset Hounds, Boxers, English Springer Spaniels, Schnauzers, and Golden Retrievers, are more susceptible to cysts due to their genetic makeup or specific characteristics.
Common Types of Cysts on Dogs
There are several types of cysts that can occur in dogs, with the majority being benign and non-cancerous. Let’s explore the most common types of cysts found externally on dogs:

1. True Cysts
True cysts are characterized by having a lining that produces secretions. They often develop in areas with sweat glands and are typically caused by blocked ducts. Surgical excision is usually recommended to prevent recurrence.
2. Dermoid Cysts
Dermoid cysts are relatively rare and occur when there is a separation of the epidermis and underlying tissue. They are often found on the neck area of certain breeds, such as Rhodesian Ridgebacks and Kerry Blue Terriers. Surgical removal is typically the treatment of choice for dermoid cysts.
3. Follicular Cysts
Follicular cysts, also known as epidermoid cysts, are one of the most common types of cysts found in dogs. They develop as a result of inflamed hair follicles and can vary in color and texture. Follicular cysts are often accompanied by comedones, which resemble blackheads. Depending on the specific characteristics of the cyst, it may contain black, white, or cheesy discharge. Follicular cysts are prone to infection and are commonly found around the mouth and legs.
4. Sebaceous Cysts
Sebaceous cysts are caused by oil glands in the skin and are prevalent in dogs. They are typically filled with sebum, an oily substance, and can become quite large and inflamed. Sebaceous cysts are commonly found around the head, neck, and tops of the legs. It’s important to monitor these cysts closely, as they can become infected or even develop into cancerous growths.
5. False Cysts
False cysts, also known as pseudocysts, do not have the secretory linings that true cysts possess. They often occur as a result of trauma or injury, where dead tissue accumulates and forms a fluid-filled mass. Most false cysts resolve on their own as the trauma heals.
Recognizing Cysts on Your Dog
Cysts can vary in appearance and texture, depending on their type. They are typically slow-growing and present as raised, smooth bumps on or under the skin. Some cysts may ooze a discharge, change in color, or ulcerate over time. It’s important to note that internal cysts, such as ovarian cysts, cannot be visually identified. However, accompanying symptoms such as behavioral changes, pain, swelling, sickness, or discharge may indicate the presence of internal growths.
When to Seek Veterinary Attention for Cysts

Regardless of the type of lump or bump you find on your dog, it’s always advisable to have a veterinarian evaluate it as soon as possible. While many cysts are benign, they can cause problems if they grow or become infected. Additionally, what may appear to be a cyst could potentially be a more serious condition requiring different treatment. If you have a wellness check scheduled in the near future and the cyst isn’t causing any discomfort to your dog, you may consider waiting until that appointment. However, it is essential to keep a journal and monitor the cyst’s growth, color changes, inflammation, and any associated symptoms. If your dog experiences pain, discomfort, or you suspect an infection, it is crucial to bring your scheduled appointment forward.
Diagnosing and Treating Cysts in Dogs
Diagnosing cysts in dogs involves various factors, such as assessing the location, breed, age, and structure of the growth. While a veterinarian may suspect a cyst based on physical examination, the only definitive way to confirm the diagnosis is through diagnostic procedures. These can include biopsy, fine needle aspiration, or histopathology, where a sample of the cyst’s cells or tissues is examined under a microscope. The results of these diagnostic tests help determine the type of cyst and rule out more serious conditions.
Treatment options for cysts on dogs depend on the specific type, location, and stage of growth. In cases where the cyst is small, not infected, and not causing any pain or discomfort, a “wait and see” approach may be recommended, with regular monitoring for any changes. Non-invasive treatments, such as medication and cleaning the area, may be sufficient for ulcerated or infected cysts. However, if the cyst is large, painful, or rapidly growing, surgical removal may be necessary. It’s important to note that attempting to express or remove a cyst at home without veterinary guidance can lead to complications and should be avoided.
Differentiating Cysts from Other Growths
It’s essential to distinguish cysts from other types of growths that can occur on dogs. One common growth often mistaken for cysts is lipomas, which are benign, fatty tumors. Lipomas are usually soft, movable masses under the skin and can be found in multiple locations on the body. Another growth to be aware of is papilloma, which appears as contagious, wart-like growths, particularly around the mouth in young dogs. Skin tags, sebaceous gland tumors, and meibomian gland tumors are other growths that can resemble cysts but have distinct characteristics and treatment approaches. Consulting with a veterinarian is crucial for accurate diagnosis and appropriate treatment.
Promoting Your Dog’s Overall Health and Well-being
While cysts are often benign and treatable, it’s important to prioritize your dog’s overall health and well-being. Regular veterinary check-ups, proper nutrition, exercise, and preventive care can help minimize the risk of developing cysts or other health issues. Maintaining a clean and hygienic environment, regularly grooming your dog, and monitoring their skin for any changes or abnormalities can also help detect cysts early.
Remember, always consult with a veterinarian for proper diagnosis and guidance. By staying vigilant and proactive in your dog’s healthcare, you can ensure a happy and healthy life for your beloved companion.
Disclaimer: The information provided in this article is for educational purposes only and should not substitute professional veterinary advice. Always consult with a veterinarian for accurate diagnosis and appropriate treatment options for your dog.

FAQs
- What causes cysts in dogs?
Cysts in dogs are commonly caused by blocked hair follicles, oil glands, or trauma to the skin. They may also develop due to genetic predispositions, infections, or underlying medical conditions. - Are cysts in dogs dangerous?
Most cysts are benign and not life-threatening. However, they can become problematic if they rupture, become infected, or interfere with your dog’s mobility or comfort. Always consult a veterinarian for proper diagnosis. - How can I tell if my dog’s cyst is serious?
Signs of concern include rapid growth, changes in appearance, redness, swelling, or discharge. If your dog seems uncomfortable or is licking the area excessively, seek veterinary advice. - Can cysts in dogs go away on their own?
Some cysts may resolve on their own, but others persist or worsen over time. Veterinary evaluation is essential to determine whether treatment or removal is necessary. - What treatments are available for cysts in dogs?
Treatments range from monitoring to surgical removal, depending on the type, size, and location of the cyst. Medications may be prescribed to address infections or underlying conditions.