Pet Health Library
A keratoma is a rare benign tumor of the inner layer of keratin-producing epidermal hoof wall cells that forms inside a horse's foot. As the tumor slowly grows, it expands and separates the hoof wall laminae, causing pain and lameness.
Equine sarcoids are the most common tumors seen and account for approximately nine out of every ten skin tumors seen in horses. They are non-malignant (i.e., they do not spread throughout the body) but do grow larger and often spread and multiply locally.