A chalazion is a small, usually painless, lump or swelling that appears on your eyelid. A blocked meibomian or oil gland causes this condition. It can develop on ...ChalazionMedicallyreviewedbyBethHollowayR.N.,M.Ed.—WrittenbyAutumnRiversonSeptember17,2018CausesandrisksSymptomsDiagnosisTreatmentPreventionOverviewAchalazionisasmall,usuallypainless,lumporswellingthatappearsonyoureyelid.Ablockedmeibomianoroilglandcausesthiscondition.Itcandevelopontheupperorlowereyelid,andmaydisappearwithouttreatment.Chalaziaisthetermformultiplechalazion.Achalazionissometimesconfusedwithaninternalorexternalstye.Aninternalstyeisaninfectionofameibomiangland.Anexternalstyeisaninfectionintheareaoftheeyelashfollicleandsweatgland.Styesareusuallypainfulandchalaziausuallyaren’t.Chalaziamaydevelopafterstyes.Youshouldseeyoureyedoctorifyouthinkyouhaveachalazion,especiallyifitblocksyourvisionorifyou’vehadchalaziainthepast.CausesandriskfactorsThechalazioniscausedbyablockageinoneofthetinymeibomianglandsoftheupperandlowereyelids.Theoiltheseglandsproducehelpstomoistentheeyes.Inflammationorvirusesaffectingthemeibomianglandsaretheunderlyingcausesofchalazia.Chalaziaaremorecommoninpeoplewithinflammatoryconditionslikeseborrhea,acne,rosacea,chronicblepharitis,orlong-terminflammationoftheeyelid.They’realsomorecommoninpeoplewithviralconjunctivitisoraninfectioncoveringtheinsideoftheeyesandeyelids.Recurringorunusualchalaziamaybesymptomsofmoreseriousconditions,butthesearerare.SymptomsAchalazionusuallyappearsasapainlesslumporswellingonyourupperorlowereyelid.Chalaziamayaffectbothupperandlowerlidsandcanoccurinbotheyesatthesametime.Dependingonthesizeandlocationofthechalazion,itmayblurorblockvision.Althoughnotascommon,achalazionmaybered,swollen,andpainfulifaninfectionispresent.DiagnosisInmostcases,adoctorcandiagnosethisconditionbytakingacloselookatthelumponyoureyelid.Yourdoctorwillalsoaskaboutyoursymptomstodetermineifthelumpisachalazion,astye,orsomethingelse.TreatmentSomechalaziacangoawaywithouttreatment.Ifyourdoctordo