Diagnosis is usually clinical. Smear for fusospirochaetal bacteria and leukocytes; blood picture occasionally. The important differentiation is with<unk>  leukemia or herpetic stomatitis. Classification<unk><unk>  is part of a spectrum of disease termed<unk>  periodontal diseases. It is the most minor form of this spectrum, with more advanced stages being termed<unk>  periodontitis,<unk>  stomatitis, and the most extreme, cancrum oris.<unk>  <unk>  refers to the clinical onset of NUG. The word<unk>  is used because usually the onset is sudden. Other forms of NUG may be chronic or recurrent.<unk><unk>  periodontitis (NUP) is where the infection leads to attachment loss, and involves only the gingiva, periodontal ligament and alveolar ligament. Progression of the disease into tissue beyond the mucogingival junction characterizes<unk>  stomatitis.
Acute necrotizing ulcerative gingivitis
Denture-related stomatitis
Contact stomatitis
Idiopathic facial aseptic granuloma
Chronic sclerosing sialadenitis
Disseminate and recurrent infundibulofolliculitis
Aphthous stomatitis
Dental abscess