Fairly rare condition in which the acromegaly actinomycosis Infection caused by bacteria. It is fairly rare and often occurs in the mouths of otherwise healthy people. The circumstances under which bacteria cause the infection is not yet quite clear. It can occur in various parts of the body when gums are inflamed or teeth extracted, and accompanying cases of persistent inflammation of the lower jaw. A hard, painful, reddish-blue swelling forms, containing yellow or greyish-white granular pus. The infection can be transmitted by the pus or saliva. Other places prone to infection are the lungs and the abdominal cavity, and from these other organs can be affected via the bloodstream. It is then a serious condition. The usual therapy is long-term treatment with antibiotics.