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DogCatChronic conditions

Skin lumps and masses

A new lump or a change in size or colour, ulceration, bleeding or pain needs veterinary assessment. Touch alone cannot separate benign from malignant masses.

Veterinary assessment needed

Go to a clinic immediately if

  • A mass bleeds heavily, swells rapidly, obstructs breathing or swallowing, or the pet collapses
Contact a veterinary clinic

Possible signs

  • A new lump or change in size, colour or firmness, ulceration, bleeding, itch or pain
  • A lump may move freely under the skin or feel fixed; appearance alone cannot establish that it is benign

Contact a veterinarian today if

  • Seek same-day care if a lump opens, becomes infected or painful, or grows rapidly

What it is

A skin or subcutaneous mass may be a cyst, inflammation, fatty lipoma or tumour. Lumps that look alike can have very different diagnoses.

What to expect at the veterinarian

The veterinarian will measure and describe the mass and often offer fine-needle sampling; biopsy, imaging or surgical removal may sometimes be needed.

Sources

Updated: 26 Oct 2026

Important information

This guide does not diagnose and does not replace veterinary advice.

Do not give human medicines, leftover antibiotics or other treatment unless a veterinarian directs you. If you are unsure how urgent a sign is, contact a veterinary clinic.