What causes a hard lump under a dog’s skin?
📅
👁 8446 views 💬 20 replies Skin Conditions
A
Expert Answer
A hard lump under the skin can come from fungal infection, parasites, poor drug absorption, insect bites, subcutaneous masses, or cysts. If the dog was recently vaccinated or injected and the drug was not absorbed, a small hard lump may appear; a warm compress can help. If the cause is unclear and the lump persists, take it to a vet promptly.
👤
Pet Owner Experience
My old lab had a hard lump that turned out to be a harmless injection site, warm compresses melted it in days. But "hard lump" covers everything from a cyst to a tumor, so don't guess. If it's new, growing, or stuck to the skin, get it aspirated. I learned to photograph lumps with a ruler so I can tell if they're changing. Better a boring vet visit than a missed cancer.