<prompt> Most common type of actinomycosis -CervicofacialThoracisAbdomenBrain  <response>: Ans. is a i.e., Cervicofacial Actinomycosis Most cases are due to A. israelii. Young males 10-30 years are most commonly affected Actinomycosis is a chronic granulomatous infection. It is characterized by the development of indurated swellings, suppuration and the discharge of sulphur granules. There are following types of actinomycosis1 Oro-cervicofacial This is the most common type and the most commonly involved site is angle of jaw causing lumping jaw.2 Other types These are abdominal, thoracic, pelvic associated with IUCD, CNS, musculoskeletal, actinomycetoma and disseminated. 