Heat rash | Miliaria

The mildest form of heat rash (miliaria crystallina) affects the sweat ducts in the top layer of skin. This form is marked by clear, fluid-filled blisters ...Scheduleyourappointmentnowforsafein-personcare.Learnmore:MayoClinicfactsaboutcoronavirusdisease2019(COVID-19)Our COVID-19patient andvisitorguidelines,plustrustedhealthinformationLateston COVID-19vaccination bysite:ArizonapatientvaccinationupdatesArizona,FloridapatientvaccinationupdatesFlorida,RochesterpatientvaccinationupdatesRochesterandMayoClinicHealthSystempatientvaccinationupdatesMCHSSkiptositenavigationSkiptoContentThiscontentdoesnothaveanEnglishversion.ThiscontentdoesnothaveanArabicversion.SectionsforHeatrashSymptoms&causesDiagnosis&treatmentPrintOverviewHeatrashOpenpop-updialogboxCloseHeatrashHeatrashMiliariarubra(A),onetypeofheatrash,appearsasredclustersofsmallblister-likebumpsthatcanproduceintenseitching.Miliariacrystallina(B),anothertypeofheatrash,appearsasclear,fluid-filledbumpsthatproducenoothersignsorsymptoms.Heatrash—alsoknownaspricklyheatandmiliaria—isn'tjustforbabies.Itaffectsadults,too,especiallyduringhot,humidweather.Heatrashdevelopswhenblockedpores(sweatducts)trapperspirationunderyourskin.Symptomsrangefromsuperficialblisterstodeep,redlumps.Someformsofheatrashfeelpricklyorintenselyitchy.Heatrashusuallyclearsonitsown.Severeformsoftheconditionmayneedmedicalcare,butthebestwaytorelievesymptomsistocoolyourskinandpreventsweating.Products&ServicesBook:MayoClinicFamilyHealthBook,5thEditionNewsletter:MayoClinicHealthLetter—DigitalEditionShowmoreproductsfromMayoClinicSymptomsAdultsusuallydevelopheatrashinskinfoldsandwhereclothingcausesfriction.Ininfants,therashismainlyfoundontheneck,shouldersandchest.Itcanalsoshowupinthearmpits,elbowcreasesandgroin.TypesofheatrashThetypesofmiliariaareclassifiedaccordingtohowdeeptheblockedsweatductsare.Signsandsymptomsforeachtypevary.Themildestformofheatrash(miliariacrystallina)affectsthesweatductsinthetoplayerofskin.Thisformismarkedbyclear,fluid-filledblistersandbumps(p


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