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Skin-nontumor

Other dermatoses

Miliaria


Reviewer: Mowafak Hamodat MB.CH.B, MSc., FRCPC, Eastern Health, St. Johns (Canada) (see Reviewers page)
Revised: 1 August 2011, last major update August 2011
Copyright: (c) 2002-2011, PathologyOutlines.com, Inc.

Definition
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● Obstruction of sweat gland ducts during high heat and humidity

Epidemiology
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● Most often seen in children, but may affect any age

Clinical features
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● Miliaria crystallina: obstruction is within stratum corneum, resulting in small clear vesicles located on trunk with high fever and pronounced sweating
● Miliaria profunda: seen in tropical climates, obstruction is at sweat duct, resulting in small papules on trunk and occasionally on extremities
● Miliaria pustulosa: miliaria rubra with pustules
● Miliaria rubra (prickly heat): obstruction within prickle cell layer, resulting in extremely pruritic erythematosus papules and vesicles usually located about the trunk and intertrigenous regions; common in infants

Clinical images
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Miliaria profunda

Micro description
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● Miliaria crystallina: subcorneal vesicle with few neutrophils; obstruction is within stratum corneu
● Miliaria rubra: intraepidermal spongiotic vesicle
● In both variants, lesion is centered around an intraepidermal eccrine sweat duct
● Miliaria profunda: spongiosis of dermal portion of eccrine sweat duct; often with adjacent chronic inflammation
● Miliaria pustulosa: features of miliaria plus intraepidermal or subcorneal pustules

Additional references
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eMedicine; DermNetNz

End of Skin-nontumor > Other dermatoses > Miliaria


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