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Pityriasis alba: a histologic study

F Vargas-Ocampo1

  • 1Departament of Dermatology, Institute of Epidemiologics Diagnostic and Reference, Mexico City, Mexico.

International Journal of Dermatology
|December 1, 1993
PubMed
Summary
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Histologic examination of pityriasis alba reveals specific features, primarily involving the pilary apparatus, aiding in diagnosis. These findings help differentiate it from chronic nonspecific dermatitis.

Area of Science:

  • Dermatopathology
  • Dermatology

Background:

  • Pityriasis alba is a common skin condition with limited histopathological research.
  • Previous studies often describe its microscopic features as nonspecific chronic dermatitis.

Purpose of the Study:

  • To investigate the characteristic histopathologic features of pityriasis alba.
  • To identify microscopic markers that can aid in diagnosing pityriasis alba.

Main Methods:

  • Retrospective light microscopic analysis of 39 biopsy specimens from patients with localized pityriasis alba.
  • Patient demographics included ages 7–37, with a predominance of females.
  • Clinical presentation involved papular erythematous, papular hypochromic, and smooth hypochromic stages.

Main Results:

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  • Histologic findings were suggestive, though not pathognomonic, of pityriasis alba.
  • Key changes observed were in the pilary apparatus: horny plugs, spongiotic edema, and atrophic sebaceous glands.
  • Disturbances in melanization and increased tissue reaction in follicular papules were noted.

Conclusions:

  • Histopathologic diagnosis of pityriasis alba can be proposed with specific findings.
  • Key features include irregular basal layer melanin pigmentation, follicular plugging, follicular spongiosis, and atrophic sebaceous glands.
  • These features are particularly evident in skin lesions exhibiting follicular papules.