What do we call markings on a horse that are characterized by a lack of color in specified areas?

The markings on a horse characterized by a lack of color in specified areas are referred to as "white markings." These markings can appear on various parts of a horse's body, such as the face, legs, and other areas, and they are primarily defined by their absence of pigmentation, showcasing the horse's underlying skin or markings against the coat color. Common examples include white socks, blazes, and stars.

The term "ermine" refers to specific markings that resemble the fur of the ermine animal, characterized by a black tip at the end of a white marking, but this does not encompass all types of color absence or white markings on horses. Scars and patterns do not specifically denote the concept of color absence in the same way white markings do, making the identification and terminology aligned with white markings as the most appropriate.