Understanding Sebaceous Gland Tumors in Dogs: When a Lump Isn’t Bad News
Finding a new lump or bump on your pet can be concerning. At Cascade Heights Veterinary Center, one of the most common questions we hear from pet owners is, “Should I be worried about this growth?” Fortunately, not every skin mass is a cause for alarm.
One example is a sebaceous gland tumor, a common type of skin growth that is often diagnosed in dogs, particularly as they age.
What Is a Sebaceous Gland Tumor?
Sebaceous glands are small glands within the skin that produce oils that help keep the skin and coat healthy. Sometimes these glands can develop benign (non-cancerous) tumors known as sebaceous gland tumors.
The good news is that these tumors have very limited potential to spread elsewhere in the body and are generally considered harmless.
How Are They Diagnosed?
When a skin mass is discovered, your veterinarian may recommend a procedure called cytology, where a small sample of cells is collected using a fine needle and examined under a microscope. Cytology often provides valuable information about the nature of a mass and helps guide treatment recommendations.
When cytology findings are consistent with a sebaceous gland tumor, this is typically reassuring news for both veterinarians and pet owners.
Do Sebaceous Gland Tumors Need to Be Removed?
In most cases, the answer is no.
Because sebaceous gland tumors are benign, surgical removal is usually not necessary unless the growth is causing problems. Many pets live comfortably with these masses for years without any complications.
However, there are situations where removal may be recommended:
• The mass repeatedly ruptures or bleeds
• The growth becomes infected
• The mass interferes with your pet’s comfort or daily activities
• The tumor changes in appearance or behavior
• The owner wishes to remove the mass for cosmetic reasons
Why Monitoring Matters
Even when cytology indicates a benign tumor, ongoing monitoring is important. No diagnostic test is perfect, and we always want to ensure the mass continues to behave as expected.
We recommend watching for:
• Rapid growth
• Changes in color
• Changes in texture or appearance
• Ulceration or bleeding
• Signs of infection
• Discomfort when touched
If you notice any of these changes, contact your veterinarian promptly. A mass that behaves differently than expected may require surgical removal and submission for histopathology, a more comprehensive laboratory evaluation of the tissue.
A Simple Tip: Take Photos
One of the best ways to monitor a skin mass is surprisingly simple: take photographs.
We encourage pet owners to photograph and measure the mass periodically. Small day-to-day changes can be difficult to notice, but photos taken over weeks or months provide an objective record that can help identify meaningful changes over time.
Consider recording:
• The date
• A photo from the same angle each time
• Measurements using a ruler or measuring tape
• Any notes about color, texture, or irritation
The Bottom Line
While discovering a lump on your pet can be stressful, a diagnosis of a sebaceous gland tumor is often welcome news. These tumors are typically benign and can frequently be managed through observation alone.
Regular monitoring, routine veterinary examinations, and prompt communication about any changes will help ensure your pet remains healthy and comfortable.
If you have questions about a skin mass on your dog or cat, our team at Cascade Heights Veterinary Center is here to help. Early evaluation of new lumps and bumps is always the best approach, and we’re happy to discuss whether monitoring or treatment is the right choice for your pet.