The other explains its common name, lumpy jaw, as A. bovis bacteria infect the mandibular bone, causing osteomyelitis[16] and the formation of periosteal new bone, giving it the classical lumpy jaw appearance.[17] It is caused by sharp objects, such as coarse feed materials or sticks, causing penetrative lesions in the mouth when ingested or by complication of periodontitis.[16][17] Deeper lesions are required to cause infections in the bone, while shallower lesions are more likely to cause mouth abscesses.[17] The bony lumps are usually not painful and can develop over weeks to months, causing facial distortion, dyspnea, and occasionally loose teeth.[16][17][18] The abscesses within the bony lumps or soft tissue commonly consist of purulent granulation tissue, often gritty in texture, surrounded by a fibrous capsule.[19]