Pyoderma

•  It is an infection characterized by the formation of pus. Acne is actually an inflammation of the hair follicles. 
• The cause of the disease is listed as being pyogenic (pus forming) organisms that have gained access to the hair follicles. 
• It will be seen most frequently in parts of the body exposed to friction from saddle or harness. It can also be transmitted via biting flies.
• An afflicted animal will show signs of tenderness when the affected body part is touched. When mature, a yellow point appears at the affected spot. Shortly thereafter it will rupture, eliminating pus. 
• When pyoderma develops, irritation of the affected area through continued saddling or harnessing should be avoided. 
• Bathing the area in warm antiseptic solutions such as hexachlorophene or providone-iodine can be helpful. 
• Antibiotics is recommended for severe infections.