Skin nontumor
Folliculitis, perifolliculitis and disease of skin appendages
Miliaria


Topic Completed: 1 August 2011

Minor changes: 6 August 2020

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PubMed Search: Miliaria

Mowafak Hamodat, M.B.Ch.B., M.Sc.
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Cite this page: Hamodat M. Miliaria. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/skinnontumormiliaria.html. Accessed October 28th, 2020.
Definition / general
  • Obstruction of sweat gland ducts during high heat and humidity
Epidemiology
  • Most often seen in children but may affect any age
Clinical features
  • 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

Microscopic (histologic) description
  • 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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