Like humans, horses' largest organ is their skin. Its function is to protect the horse's body against the effects of the environment. Like humans, horses can burn in the sun. The unpigmented pink skin is particularly at risk. Sunburn of horses most commonly occurs around the eyes and lips of the horse and on the legs, where the skin is barely covered or only thinly covered by hair. To avoid sunburn on the horse's skin, use the sunburn cream in the horse care category.