Root Causes: Why Dogs Develop Non-Cancerous Skin Masses

Dogs frequently develop skin masses as they age. Many are benign (non-cancerous) and result from normal cellular changes, blocked glands, or fatty deposits.

Common types include:

• Lipomas (fatty tumors, soft and movable under the skin)
• Sebaceous cysts (blocked oil glands filled with material)
• Skin tags and warts (often age-related or viral)
• Histiocytomas (benign growths, often in younger dogs)
• Fibromas (connective tissue growths)
• Abscesses (pockets of infection from bites or wounds)

Contributing factors include:

• Aging
• Genetics and breed predisposition
• Obesity (especially with lipomas)
• Minor trauma or irritation
• Skin infections or blocked glands

How Common Is It?

Skin masses are extremely common:

• A majority of dogs over age 7 will develop at least one lump
• Many are benign, but appearance alone cannot confirm this
• Veterinary evaluation is often needed to distinguish harmless from serious

What You’ll Notice (From Mild to Severe)

Early / Mild Signs

• Small lump under or on the skin
• Soft or slightly firm texture
• Moves freely under the skin (common with lipomas)
• No pain or discomfort

Moderate Changes

• Growth in size over time
• Changes in texture (firmer or irregular)
• Surface irritation or redness
• The dog begins licking or scratching the area

Advanced Concerns

• Rapid growth
• Ulceration (open sore)
• Bleeding or discharge
• Firm, fixed (non-movable) mass
• Pain when touched

Severe / Concerning Signs

• Interference with movement (if near joints)
• Infection or abscess formation
• Multiple masses appearing quickly
• Changes in behavior due to discomfort

⚠️ While many masses are benign, these signs require prompt evaluation.

Complications of Leaving It Untreated

Even benign masses can lead to issues if ignored:

• Infection or rupture (especially cysts or abscesses)
• Growth that interferes with movement or comfort
• Misdiagnosis of a malignant tumor
• Chronic irritation or self-trauma (licking/biting)
• Delayed treatment if a mass turns out to be more serious

Standard Treatment Options (and How They Work)

1. Veterinary Evaluation

• Physical exam
• Fine needle aspiration (FNA) to analyze cells
• Biopsy if needed

2. Monitoring (“Watch and Measure”)

• Many benign masses are simply tracked over time
• Owners may measure size regularly and note changes

3. Surgical Removal

• Recommended if the mass:
  • Grows rapidly
  • Causes discomfort
  • Becomes infected
  • Interferes with movement

4. Treating Underlying Issues

• Antibiotics for infected masses
• Drainage of abscesses
• Weight management for dogs prone to lipomas

Common Medications Your Vet May Prescribe

• Antibiotics (for infected or abscessed masses)
• Anti-inflammatory medications
• Pain relief (if the mass causes discomfort)

When You Can Monitor at Home (and When You Should NOT)

Safe for Home Monitoring

• Small, soft, slow-growing lump
• No pain, redness, or discharge
• The dog is behaving normally

➡️ Track size and appearance regularly

DO NOT Ignore or Monitor Alone If You Notice:

• Rapid growth
• Firm or irregular shape
• Ulceration, bleeding, or discharge
• Pain or sensitivity
• Sudden appearance of multiple masses

Call the Vet Immediately If:

• The mass becomes infected or ruptures
• Your dog shows signs of pain
• The lump interferes with walking or eating
• There are sudden changes in size or shape

⚠️ Any new lump should be evaluated at least once to confirm it is benign.

Warnings About Home Treatment

• Do not attempt to drain or remove a mass yourself
• Misidentifying a tumor can delay critical treatment
• Over-the-counter treatments are ineffective for most masses
• Even benign growths can become problematic if neglected

Prevention: What You Can and Can’t Control

While many benign masses cannot be fully prevented:

• Maintain a healthy weight
• Provide regular grooming and skin checks
• Address skin infections promptly
• Schedule routine veterinary exams
• Monitor any new lumps early

The Bottom Line

Not every lump is dangerous—but every lump deserves attention. Most non-cancerous skin masses in dogs are manageable, especially when caught early. The key is not to panic, but also not to ignore changes. A simple check can provide peace of mind—or catch a problem before it becomes serious.