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KMID : 0363219930310040548
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Korean Journal of Dermatology
1993 Volume.31 No. 4 p.548 ~ p.558
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The Study of Incidence and Distribution of pityrospoum on Clinically Normal Skin
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Abstract
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Background:
@EN Previous studies have suggested that pityrosporum yeasts, normal resident flora of skin, may be important in the pathogenesis of dandruff seborrheic dermatitis and confluent and reticulated papillomtosis.
@ES Objective:
@EN We investigated the incidence and distribution of pityrosporum yeasts on clinically normal skin as a more reasonable method for providing the basic data for proving the relationship of pityrosporum and pathogenesis of the diseases.
@ES Methods:
@EN A total of 350 subjects were studied. Skin scrapings were stained with 20% Parker inkKOH(P-KKOH) solution. The numbers of pityrosporum spores and hyphae per high power field(×400) were counted and designated according to a new grading method
using
bacterial index(BI) of lepra bacilli.
@ES Results:
@EN The incidence rates of pityrosporum orbiculare(P. orbiculare) and pityrosporum ovale(P. ovale) were highter than that of P. ovale on all examined sites except for the anterior scalp. And pityrosporal hyphae was present on anterior and
posterior
scalp and earwax in 24-25% of subjects respectively. The incidence of pityrosporum was higher in summer than other seasons. The incidence rate of P. orbiculare and hyphae in the group aged below 9 (except neonates) and above 60, were lower than
that of
other age groups. The incidence rates and distribution of grades of pityrosporum of neonates were lower than those of older subjects.
@ES Conclusion:
@EN The results of this study showed that the incidence and distribution of pityrosporum spores were similar to previous reports and hyphal forms were found 25% approximately on clinically normal skin of the scalp and earwax. The significance of
the
presence of pityrosporal hyphae and the relationship between normal skin and pityrosporal hyphae are to be further elucidated.
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KEYWORD
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