Pigmentary disorders.

There are several pigmentary disturbances which occur in the horse, some of which are primary inherited conditions related to the breed, while others are acquired. All are related to the amount of melanin present in the epidermis, dermis or hair and the activity of melanocytes in these areas may be independent of each other. Within this section, a general discussion of leukoderma and leukotrichia is presented along with a few specific conditions recognized as abnormalities of pigmentation.