The term dermatophilosis probably doesn't mean much to you. But when we write rain scabies, it probably rings a bell. Dermatophilosis or rain scab is a skin infection that is common in horses and is most commonly seen during the wetter periods of the year. The condition is caused by a bacterium called dermatophilus. A bacterium that does not cause immediate harm, but when the horse's skin has suffered minor damage, the bacterium can cause damage. Is there anything you can do about it? Fortunately there is! Read along?