Also called periadenitis mucosa necrotica recurrens or Sutton’s disease.  It initiates with a reddish nodule that due to necrobiosis becomes an ulcer of larger size and depth than that of a common aphthae.  They may appear as one or various lesions, are very painful and heal very slowly.  The constant recurrence of lesions is despairing to the patient, interrupts normal feeding and causes sialorrhea and halitosis.  It is characterized by leaving behind fibrous scars.  The etiology is similar to that of aphthous ulcers