简介：Eosinophiliculceroforalmucosa(EUOM)isanonspecificclinicalappearance,whichappearstobefrequentlyunrecognizedormisdiagnosedusuallyassquamouscellcarcinoma(SCC),especiallyinoldpatients.Itisarareself-limitedbenignulcerativedisease,anditischaracterizedwiththeinfiltrationofeosinophilicleukocytesmixedwithotherinflammatorycells,1,2suchasthemitoticallyactivelargemononuclearcellswithroundorovoidpalenucleus.Thiscelltype,ofteninterpretedasahistiocyte,confoundsthehistologicevaluationandoccasionallyleadstotheerroneousdiagnosisoflymphohistiocyticmalignantcondition.Althoughithasassumedthattraumaisanimportantetiologicfactor,theexactpathogenesisremainsunclear.3ThemorbidityofthisdiseaseislowandtherearefewChineseliteraturesaboutit,4soitisnecessarytopaymoreattentiontoit.Inthisarticle,3outof5casesofEUOMaremisdiagnosedasSCC,andwewillreporttherecordsinordertoidentifyitfromSCCwell.