A chronic granulomatous condition of horses, cattle, swine, and humans, usually involving the skin but occasionally also the viscera, and characterized by granules in the pus, consisting of masses of bacteria, generally staphylococci but sometimes other types, surrounded by a hyaline capsule that sometimes exhibits clublike bodies around its periphery; the anatomic structure of the lesion resembles that of actinomycosis and mycetoma. SYN: actinophytosis (2). [fr. Botryomyces]