Heat rash occurs in babies when the pores of the sweat glands become blocked. This happens most often when the weather is hot or humid. As your infant sweats, little red bumps, and possibly tiny blisters, form because the blocked glands cannot clear the sweat.
To avoid heat rash, keep your baby cool and dry during warm weather.
Some helpful suggestions:
Heat rashes and babies; Prickly heat rash; Red miliaria
Goddard DS, Gilliam AE, Frieden IJ. Vesiculobullous and Erosive Diseases in the Newborn. In: Bolognia JL, Jorizzo JL, Schaffer JV, et al, eds. Dermatology. 3rd ed. Philadelphia, Pa: Mosby Elsevier; 2012:chap 34.
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.
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