Horse Facial Markings
Blaze
A blaze covers the whole bridge of the nose, from the forehead area, down to the nose. Blazes can be very symmetrical, or they can wander down the face unevenly. A blaze is much wider than the strip. The difference between a strip and a blaze is the width, as blazes cover most of the horse's face between the ridges of the bone.
Bald
A bald face is covered with a much wider white marking than a blaze. The white areas extend from the forehead to the nose, and from side to side beyond the eye area to the cheekbones. The whole nose and muzzle area can be white. It's not uncommon to see bald faced horses with blue eyes. Horses with a lot of white on their noses may be more prone to sunburn. Bald faces are common in some Paint and pinto horses as well as Clydesdales. There are specific names within some breeds for types of bald faces such as apron or medicine hat.
Ermine
An ermine is a small colored spot within any white area on the horse's face. Ermines may appear within a star or blaze. The may be round or very asymmetrical. Ermines also appear on leg markings. It's not unusual to see a black ermine on a lighter colored horse. These ermine spots are genetic. Dark spots within the coat color are called Bend-Or spots.
Combinations
Combinations of these markings result in horses' unique facial markings. Typical combinations include star and strip, star and snip, and star, strip and snip. These combinations are an important way to identify individual horses. On medical records and breed registration records these identifying marks are photographed or drawn so that the horse's identity can be verified.
If your horse suddenly develops white markings around the eyes these aren't likely to be permanent. White or pinkish areas may actually be a skin condition called Vitiligo. Scars too may leave white markings on a horse, but the skin beneath will not be lighter like a true marking the horse was born with.