The worldwide diversity of scalp seborrhoea, as daily experienced by seven human ethnic groups

Pouradier, Florence; Liu, C.; Wares, Joanna R.; Yokoyama, Eise; Collaudin, C.; Panhard, S.; Saint‐Léger, D.; Loussouarn, G.

doi:10.1111/ics.12425

Cited by 10 publications

(11 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The average amount of sebum in the scalp of men is about 1.5 times higher than that of women. This sebum amount result is consistent with that from another study performed by L'Oreal [13]. There is less amount of ceramide present in the horny layer of men's scalp.…”

Section: Basic Features Of Scalp: Sex and Racessupporting

confidence: 91%

Understanding the Characteristics of the Scalp for Developing Scalp Care Products

Kim¹,

Shin²,

Kim³

et al. 2021

JCDSA

View full text Add to dashboard Cite

With the exception of conditions such as dandruff, interest in the scalp is relatively low. However, when we consider the scalp as part of the skin, interesting observations can be made. The average amount of sebum secretion in the scalp varies depending on sex. Several studies show differences in scalp characteristics among races, but in some cases, these are difficult to find. The scalp has a weaker barrier function than does facial skin. The reason for the weak barrier function is unclear, but it is necessary to consider the effect of dandruff on the scalp. Growth of dandruff-related bacteria weakens the barrier. However, strengthening the barrier suppresses dandruff. In other words, there is an interdependency between scalp bacteria and skin, which is important for the maintenance of scalp barrier homeostasis. Anxiety regarding a sensitive scalp is as high as that for sensitive skin. At least 40% -50% of individuals in modern society have complaints such as itching due to a sensitive scalp. The sensitivity of the scalp is similar between races. This is not a skin disease, but we have to think about how problems that customers face can be solved. Skin barrier and sensitive scalp are closely related. Collectively, strengthening or lowering the effect on the scalp barrier may result in a healthy scalp environment. As a result, it will alleviate people's complaints about the scalp.

show abstract

Section: Basic Features Of Scalp: Sex and Racessupporting

confidence: 91%

Understanding the Characteristics of the Scalp for Developing Scalp Care Products

Kim¹,

Shin²,

Kim³

et al. 2021

JCDSA

View full text Add to dashboard Cite

show abstract

“…It seems that the balance interaction between host and commensal bacteria plays a significant role in dandruff pathogenesis. 10,11 Our study also showed that the sebum in our dandruff subjects hijab or non hijab still within normal level compared to the data of Thailand population (15 μg/cm 2 ), 12 while the TEWL from our study higher than normal level (13 g/m 2 /h). 13 These findings support that dandruff as a mild form of seborrhoic dermatitis is a manifestation of skin barrier disfunction, which showed increasing of TEWL.…”

Section: Acknowledgementssupporting

confidence: 70%

The role of Malassezia sp., sebum level and trans epidermal water loss (TEWL) toward the dandruff severity between hijab and non hijab wearing subjects

et al. 2018

View full text Add to dashboard Cite

Dandruff is a common symptom in adolescence, which possibly due to increasing of Malassezia sp. colonization, sebum level as well as skin hydration. Wearing hijab is predicted to increase the humidity and sebum level lead to increase the number of Malassezia sp. and dandruff severity. A case-control study was conducted on 19 female with dandruff who wear hijab and 19 female with dandruff who do not wear hijab, age between 18 and 27 years old. The dandruff severity was defined clinically using a scoring system (0-100), only subjects with minimum score of 28 will be included in this study. The sebum and trans epidermal water loss (TEWL) levels were measured with Sebumeter and Tewameter from Courage Khazaka. The Malassezia sp. was examined using microscopic examination of the squama and culture in the Saboraud medium. There were no significant differences found between hijab and non-hijab groups for dandruff severity. No difference found between two groups for sebum level, Malassezia sp. number microscopically, and Malassezia sp. colonization. Only TEWL level in hijab group that was found to be higher than non-hijab group. Wearing hijab does not increase the dandruff severity, sebum level and colonization number of Malassezia sp. Wearing hijab is found to increase the TEWL level. ABSTRAK Ketombe merupakan gejala umum pada masa remaja, yang disebabkan oleh meningkatnya coloni Malassezia sp., tingkat sebum serta hidrasi kulit. Penggunaan jilbab diperkirakan menyebabkan peningkatan kelembaban dan sebum yang akan meningkatkan jumlah Malassezia sp. dan tingkat keparahan ketombe. Sebuah studi kasus-kontrol dilakukan pada 19 wanita berketombe yang memakai jilbab dan 19 wanita berketombe yang tidak memakai jilbab, usia antara 18 dan 27 tahun. Keparahan ketombe didefinisikan secara klinis menggunakan sistem penilaian (0-100), hanya subjek dengan skor minimal 28 yang akan dimasukkan dalam penelitian ini. Tingkat sebum dan trans epidermal water loss (TEWL) diukur dengan Sebumeter dan Tewameter dari Courage Khazaka. Malassezia sp. diperiksa menggunakan pemeriksaan mikroskopik dari skuama dan kultur dalam medium Saboraud. Tidak ada perbedaan signifikan yang ditemukan antara kelompok hijab dan non-hijab untuk keparahan ketombe. Tidak ada perbedaan yang signifikan ditemukan antara dua kelompok untuk tingkat sebum, jumlah Malassezia sp. secara mikroskopis, dan koloni Malassezia sp. Ditemukan tingkat TEWL kelompok berhijab lebih tinggi daripada kelompok non-hijab. Memakai jilbab tidak meningkatkan keparahan ketombe, tingkat sebum, serta jumlah kolonisasi Malassezia sp. Memakai hijab meningkatkan tingkat TEWL.

show abstract

“…Previous studies have suggested a prominent role of host-associated physiological factors in the manifestation of dandruff (Xu et al, 2016 ; Pouradier et al, 2017 ). A systematic investigation of the host physiological parameters was carried out to study the association of host physiology with dandruff and with the scalp microbiome (Table S2 ).…”

Section: Resultsmentioning

confidence: 95%

“…Due to the inherent diversity in ethnicity, climatic conditions, diet, and other factors, a distinct microbial diversity was anticipated in the Indian population, which was evident from the high abundance of uncultured Malassezia sp. in the scalp microbiome (Pouradier et al, 2017 ). These observations necessitate the strain-level in vitro characterization of the unknown Malassezia species to identify population-specific biomarkers, and to understand their possible role in the etiology of dandruff in the various populations.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Healthy and Dandruff Scalp Microbiome Reveals the Role of Commensals in Scalp Health

Saxena

Mittal

Clavaud

et al. 2018

Front. Cell. Infect. Microbiol.

117

View full text Add to dashboard Cite

Several scalp microbiome studies from different populations have revealed the association of dandruff with bacterial and fungal dysbiosis. However, the functional role of scalp microbiota in scalp disorders and health remains scarcely explored. Here, we examined the bacterial and fungal diversity of the scalp microbiome and their potential functional role in the healthy and dandruff scalp of 140 Indian women. Propionibacterium acnes and Staphylococcus epidermidis emerged as the core bacterial species, where the former was associated with a healthy scalp and the latter with dandruff scalp. Along with the commonly occurring Malassezia species (M. restricta and M. globosa) on the scalp, a strikingly high association of dandruff with yet uncharacterized Malassezia species was observed in the core mycobiome. Functional analysis showed that the fungal microbiome was enriched in pathways majorly implicated in cell-host adhesion in the dandruff scalp, while the bacterial microbiome showed a conspicuous enrichment of pathways related to the synthesis and metabolism of amino acids, biotin, and other B-vitamins, which are reported as essential nutrients for hair growth. A systematic measurement of scalp clinical and physiological parameters was also carried out, which showed significant correlations with the microbiome and their associated functional pathways. The results point toward a new potential role of bacterial commensals in maintaining the scalp nutrient homoeostasis and highlights an important and yet unknown role of the scalp microbiome, similar to the gut microbiome. This study, therefore, provides new perspectives on the better understanding of the pathophysiology of dandruff.

show abstract

The worldwide diversity of scalp seborrhoea, as daily experienced by seven human ethnic groups

Abstract: The kinetics and slopes of the re-greasing process of the human scalp appear similar in all ethnic groups studied. However, striking quantitative differences are found between the seven ethnic groups, resulting from different sebaceous production levels and scalp hygiene routines.

Cited by 10 publications

References 32 publications

Understanding the Characteristics of the Scalp for Developing Scalp Care Products

Understanding the Characteristics of the Scalp for Developing Scalp Care Products

The role of Malassezia sp., sebum level and trans epidermal water loss (TEWL) toward the dandruff severity between hijab and non hijab wearing subjects

Comparison of Healthy and Dandruff Scalp Microbiome Reveals the Role of Commensals in Scalp Health

Contact Info

Product

Resources

About