A chalazion is a slowly developing lump that forms due to blockage and swelling of an oil gland in the eyelid. A chalazion often starts out as a very small, tender, ...EyeandVisionConditionsAcanthamoebaAccommodativeDysfunctionAmblyopiaAnteriorUveitisAstigmatismBlepharitisCataractColorVisionDeficiencyComputerVisionSyndromeConcussionsConjunctivitisConvergenceInsufficiencyCornealAbrasionDiabeticRetinopathyDryEyeEyeCoordinationFloaters&SpotsGlaucomaHordeolumHyperopiaKeratitisKeratoconusMacularDegenerationMigrainewithAuraMyokymiaMyopiaNystagmusOcularAllergiesOcularHypertensionOcularMigrainePingueculaPresbyopiaPterygiumPtosisRetinalDetachmentRetinoblastomaRetinitisPigmentosaStrabismusSubconjunctivalHemorrhageVision-RelatedLearningProblemsHealthyEyes/EyeandVisionConditions/ChalazionChalazionAchalazionisaslowlydevelopinglumpthatformsduetoblockageandswellingofanoilglandintheeyelid.Achalazionoftenstartsoutasaverysmall,red,tender,swollenareaoftheeyelidandisgenerallynotaninfection.Inafewdays,itmaychangetoapainless,slow-growinglumpthesizeofapeaandcanoftenbeconfusedwithastye(orhordeolum),whichisan infection ofanoilglandintheeyelid.Astyeproducesared,swollen,painfullumpontheedgeortheinsideoftheeyelidandusuallyoccursclosertothesurfaceoftheeyelidthanchalazion.Ifleftuntreated,astyecanresultintheformationofachalazion.Donotattempttosqueezeordrainthechalazionasitmayrequiretreatmentforproperhealing.Causes&riskfactors Acnerosacea.Chronicblepharitis(inflammationoftheeyelids,oftenfromexcessbacteria).Seborrhea.Tuberculosis.Viralinfection.Rarelychalazions maybeanindicationofaninfectionorskincancer.Symptoms Painlessbumporlumpintheuppereyelidor,lessfrequently,inthelowereyelid.Causedbyathickeningofthefluidintheoil(meibomian)glandsoftheeyelid.Tearingandmildirritationmayresultastheobstructedglandsareneededforhealthytears.Blurredvision,ifthechalazionislargeenoughtopressagainsttheeyeball.Morecommoninadultsthanchildren;mostfrequentlyoccursinpeopleages30-50.Typicallydisappearswithouttreatmentwithinseve