Actinomycosis is a chronic, bacterial infection caused by Actinomyces bacteria, which is found in the human body and in the environment. Clinically, actinomycosis appears as a slowly-growing, lumpy, hard mass, known as a “lumpy jaw” or “woody tumor”. It often appears as a single lesion on the face, neck, chest, or abdomen, but may also be seen in other areas of the body. The lesion is usually painless and may be mistaken for an abscess, a tumor, or a cyst.
Actinomycosis can spread to other parts of the body, and can cause severe damage to organs and tissue. Symptoms vary depending on the affected area, but may include fever, chills, night sweats, weight loss, fatigue, and a general feeling of ill health. In some cases, the infection may cause the formation of sinus tracts, which are long tunnels that can form between the skin and underlying tissues.
Diagnosis of actinomycosis is usually made based on the clinical appearance of the lesion, as well as on a history of exposure to the bacteria. Blood tests, imaging studies, and culture of samples from the affected area may also be used to confirm the diagnosis. Treatment usually involves a combination of antibiotics, as well as surgical removal of the lesion.