Help! My Dog Has a Lump! (Vet Answered)
This question has been answered by a vet
Veterinarian & Animal Behaviorist
With nearly two decades in veterinary medicine, Dr. Paola brings hands-on experience across multiple species. A graduate of the University of Guadalajara, she specializes in preventive care, animal welfare, and positive reinforcement training.
The Question
“My pitbull, Speedy, has a lump on her front foot. It’s missing hair around it, which is brownish red. She got a allergy shot last month, but it never went away. What could it be?? ” – Crystal
Quick Info about Speedy
Hi Crystal,
I understand how concerning it is to find a persistent lump on your dog’s foot, especially when it has not improved after an allergy injection. A hairless, brownish-red lump in this location is often related to ongoing local inflammation rather than a simple allergy flare. In dogs, the paws are exposed to repeated pressure, moisture, and irritation. Common causes include interdigital furunculosis, which is an inflammatory condition of the hair follicles, lick-associated lesions driven by chronic irritation, or benign growths such as histiocytomas. Less commonly, but importantly, mast cell tumors and other skin neoplasms can also appear red, swollen, and resistant to anti-inflammatory treatments, which is why persistence matters clinically.
An allergy injection would reduce generalized allergic inflammation, but it would not resolve a localized lesion if infection, foreign material, or abnormal cell growth is present. When a lesion does not respond as expected, the next step is hands-on evaluation, often including cytology or biopsy, which is similar to checking the contents of a locked box rather than guessing what is inside. These tests are well established in veterinary dermatology and are essential for determining whether treatment should focus on infection control, behavioral modification, anti-inflammatory therapy, or surgical removal.
Because this involves a physical mass, Speedy should be examined by a veterinarian sooner rather than later, as prompt evaluation helps prevent discomfort and allows early intervention if the lesion is more serious. So please, don’t wait.
– Dr. Paola