Actinomycotic mycetoma and actinomycosis are two different diseases caused by the same type of bacteria, Actinomyces. Both diseases can cause lesions, abscesses, and masses in different parts of the body, but the differences between them lie in the type of bacteria and the size and location of these lesions.
Actinomycotic mycetoma is caused by the bacteria Nocardia and Streptomyces, and usually appears as a tumor-like mass in the skin or subcutaneous tissue. It is often found in the head, neck, or upper limbs, and can cause chronic draining sinuses and abscesses. This condition can spread to other parts of the body, including the lungs, bones, and lymph nodes.
Actinomycosis is caused by different species of Actinomyces, and is most often found in the chest, abdomen, and pelvis. It is characterized by abscesses, fistulas, and draining sinuses, and can spread to other parts of the body, including the bones, liver, and brain.
In summary, actinomycotic mycetoma is caused by Nocardia and Streptomyces bacteria and usually appears as a tumor-like mass on the skin or subcutaneous tissue in the head, neck, or upper limbs. Actinomycosis is caused by different species of Actinomyces and is most often found in the chest, abdomen, and pelvis, and can spread to other parts of the body.