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DogSkin & coat

Skin lumps / bumps in dogs: what to do

Any new, growing or ulcerated lump should be checked with a fine-needle aspirate.

What are the common causes?

Acute moist dermatitis (hot spot)

Monitor for 48 hours

A moist red sore that expands within hours of licking/scratching — most common in warm, humid months.

Flea allergy dermatitis

Monitor for 48 hours

An allergic reaction to flea saliva — a single flea bite can trigger intense itching.

Allergic dermatitis (atopy)

Monitor for 48 hours

A chronic skin inflammation allergic to pollen, dust mites or food proteins — paw licking is the classic sign.

Home care & observation tips

  • ✓Use an e-collar to stop licking
  • ✓Keep the sore dry and aired
  • ✓Have it treated and find the underlying trigger
  • ✓Treat ALL pets in the household for fleas
  • ✓Clean the environment (hot-wash bedding, vacuum)
  • ✓Use an e-collar to prevent scratching damage

When must you see a vet?

  • ⚠The sore spreads quickly or oozes pus
  • ⚠Repeatedly recurs in the same spot
  • ⚠Widespread broken, infected skin
  • ⚠Puppy anemia from fleas (pale gums)
  • ⚠Broken, oozing or broadly bald skin
  • ⚠Itching that disrupts sleep and meals

FAQ

Is skin lumps / bumps in dogs serious?

It depends on the combination of symptoms, how long it has lasted, and your pet's energy and appetite.It is often linked to mild issues, but if nothing improves within 48 hours a vet visit is warranted. Enter the full symptom combination in our symptom checker for a more specific urgency assessment.

Can I monitor at home first? What should I watch?

If energy and appetite are normal with no other signs, 24-48 hours of monitoring is reasonable. Keep notes on frequency, duration, appetite, water intake, energy and what the stool/urine looks like — vets find this very useful.

What should I prepare before the clinic?

Note when the symptom started and how it changed; bring packaging or residue if ingestion is suspected; bring vaccination and deworming records; and if possible take a video (odd gait, cough sound) — clearer than describing.

Not sure how serious it is? Assess it with the symptom checker

Start symptom check →