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Journal of Cosmetics, Dermatological Sciences and Applications, 2016, 6, 34-40
Published Online March 2016 in SciRes. http://www.scirp.org/journal/jcdsa
http://dx.doi.org/10.4236/jcdsa.2016.61005
How to cite this paper: Baumann, L. (2016) Validation of a Questionnaire to Diagnose the Baumann Skin Type in All Ethnici-
ties and in Various Geographic Locations. Journal of Cosmetics, Dermatological Sciences and Applications, 6, 34-40.
http://dx.doi.org/10.4236/jcdsa.2016.61005
Validation of a Questionnaire to Diagnose
the Baumann Skin Type in All Ethnicities
and in Various Geographic Locations
Leslie Baumann1,2
1Baumann Cosmetic and Research Institute, Miami, USA
2Division of Cosmetic Dermatology, University of Miami, Miami, USA
Received 3 November 2015; accepted 12 March 2016; published 15 March 2016
Copyright © 2016 by author and Scientific Research Publishing Inc.
This work is licensed under the Creative Commons Attribution International License (CC BY).
http://creativecommons.org/licenses/by/4.0/
Abstract
The Baumann Skin Typing System diagnoses patients as having one of 16 skin types based on their
answers to a validated questionnaire [i] known as the Baumann Skin Type Indicator [ii]. The BSTI
questionnaire has been tested over the last decade on over 200,000 people of various ages and
ethnicities in different geographic locations around the world. In this study, data were collected
from 52,862 patients to compare skin type prevalence between those who presented to doctor’s
offices and those who took the quiz without supervision online. The most common skin types va-
ried only slightly between patients that took the quiz online and those that completed the ques-
tionnaire in their doctor’s office. This indicates that the prevalence of skin types seen in the doc-
tor’s office is similar to that in the general population and that supervision is not necessary to get
an accurate result on the BSTI. [iii] In addition, comparison of data gathered in China, Korea, and
the US did not show a significant difference in skin type prevalence between Asian and Caucasian
skin types. [iv] This study demonstrates that the English version of the BSTI is valid for English
speaking patients online, and in doctors’ offices in the US, China and Korea.
Keywords
Skin Type, Regimen, Cosmeceutical, Skin Care, Oily, Dry, Sensitive, Pigmented, Wrinkled,
Photoaged, Melasma, Pre-Operative, Post-Operative, Acne, Rosacea, Contact Dermatitis,
Antioxidants, Retinoids, Baumann Skin Type, BSTI, Skin IQ, Skin Type Solutions, Systems-Based
Approach, Standardized Methodology, Validated, Validation, Scientific, Ethnicity, Asian, Hispanic,
Caucasian, Questionnaire, Diagnostic, Diagnose, Prescribe, Educate, Outcomes, Compliance
L. Baumann
35
1. Introduction
There is much misinformation about the difference in skin biology among various ethnicities. Although skin
tone varies among various ethnicities, the underlying biology of the skin remains the same in all ethnicities with
the exception of differences in skin color and the incidence of post -inflammatory hyperpigmentation. Skin color
in darker-pigmented individuals occurs because melanocytes produce more melanin, the melanosomes are larger
and more heavily melanized, and undergo degradation at a slower rate than in lighter skinned individuals [1]-[3].
Asians, Hispanics and African Americans suffer from the same skin issues such as an impaired barrier, tendency
to inflammation and increased sebum production as other skin colors do. Darker types are at a lower risk for
skin aging because the melanin provides a protective effect to the DNA. Rosacea may be less obvious in darker
skin types, even when underlying redness is apparent. For this reason, we sought to determine if a questionnaire
that was validated for use in Caucasian skin would be accurate for use in other ethnicities. The BSTI question-
naire was given to over 52,000 people and the results were compared by ethnicity. Dermatologists in Korea and
China gave the questionnaire to their patients and the data were compared to results gathered online in the Unit-
ed States and in dermatologist’s offices in the Unites States. The physicians in the USA, China and Korea felt
that the Baumann Skin Type Indicator Questionnaire accurately reflected the dermatologic skin issues of their
patients and was a useful diagnostic tool in their medical practice.
2. Need for a Diagnostic Questionnaire That Is Accurate for All Ethnicities
As skin care science has progressed and many new ingredients have been discovered, the efficacy of skin care
products has improved as shown in multiple studies. However, a research setting does not mimic real life. In a
research study, the investigators take great care in screening and choosing recipients most likely to experience
improvement from the study product. In fact, detailed inclusion and exclusion criteria are used to determine who
will be enrolled in a study. In the real world, patients self-select what skin care products they use based on cele-
brity endorsements, a friend’s recommendation or product marketing with little regard for their underlying skin
biology. Without a clear diagnostic process, it is very difficult to match the correct skin care products to the cor-
rects in type. Using a photograph or a quick visual analysis is not enough information to determine skin type
because that only shows the skin at a particular point in time and does not give any historical information. His-
torical information is crucial in determining skin type because it is important to understand how the skin reacts
in various environments and when exposed to various types of products and situations. A validated method of
skin type diagnosis is also important because patients notoriously are incorrect about their skin type as illu-
strated in a study of 94 Korean women who subjectively rated their skin type as oily, dry, or normal. The sub-
jective self-rating was compared to sebometer measurements, which showed that subjects underestimated their
skin’s sebum production and often called themselves “dry” when in fact the skin was “oily” [4]. Seasonal varia-
tions in sebum secretion can confuse subjects [5] as can any biases or myths that they believe about their skin.
Asking patients questions about their skin is also a form of patient education. When patients are asked to
check off a series of behavioral habits such as smoking, use of tanning beds, consumption of fruits and vegeta-
bles, how many hours of nightly sleep, and other lifestyle choices or patterns, they begin to consider that these
habits may have an effect on their skin health. This helps open the dialogue and expands communication be-
tween the patient and physician. The process of “diagnose, prescribe and educate” is a strategy used to initiate
skin care discussions between the patient and the physician. A questionnaire facilitates all three of these steps. In
fact, diagnosing the patient’s skin type paves the way for distributing customized patient education material di-
rectly to those for whom the information is most applicable.
Using a validated questionnaire to select patients for a treatment method is a similar approach to using inclu-
sion and exclusion criteria in a research study and allows a standardized methodology to track product efficacy
according to skin phenotype. This systems-based approach sets the stage for physicians to systematically track
efficacy and collaborate with colleagues to discuss and publish results and address complications arising from
skin care recommendations including topical prescription medications.
3. The Baumann Skin Type Indicator
The Baumann Skin Type Indicator (BSTI) is a validated questionnaire [6], which consists of a 3- to 5-minute
computer-based questionnaire assessing 4 main parameters of the skin: 1) oily vs. dry, 2) sensitive vs. resistant,
3) pigmented vs. non-pigmented, and 4) wrinkle-prone vs. tight. Depending on the way the questions are ans-
L. Baumann
36
wered, the patient is diagnosed as having a distinct skin phenotype known as the Baumann Skin Type®. There
are 16 possible Baumann Skin Types based on these four parameters. The Baumann Skin Type is designated by
4 letters and a corresponding color and number (Figure 1). For example, a dry, resistant, non-pigmented, wrin-
kle-prone type would be designated as DRNW. The Baumann Skin Types may also be designated by a scalloped
colored octagon containing a number corresponding with the skin type (Figure 2). The Baumann Skin Type
(BST) can vary with seasons, hormone fluctuation, lifestyle changes, pregnancy, medications, move to a new
geographic location, and other factors. Patients should retake the questionnaire if they have experienced any of
these changes so that their skin care regimen can be properly adjusted. The goal of skin care targeted to skin
type is to change the skin type to the most desirable skin type: ORNT (hydrated, non-inflamed, even skin tone,
no wrinkles.)
This bingo card design of the 16 Baumann Skin Types is a trademark of Metabeauty, Inc. and is used with permission.
Figure 1. The 16 Baumann skin types.
L. Baumann
37
This scalloped octagon design of the 16 Baumann Skin Types is a trademark of Metabeauty, Inc. and is used with permission.
Figure 2. The 16 Baumann Skin Types are designated by scalloped octagons with a corresponding number and color.
4. Characteristics of the 4 Parameters
Dry (D) skin is characterized by an impaired lipid barrier surrounding the keratinocytes. An impaired barrier in-
creases transepidermal water loss (TEWL) and renders the skin more susceptible to irritation from retinoids,
acne medications, and other irritating ingredients. Having dry skin does not equate to having sensitive skin, be-
cause having dry skin alone is not enough to activate inflammatory cascades, which is necessary in order for in-
flammation to occur. However, dry skin types are more susceptible to the allergic type of sensitive skin because
the impaired barrier facilitates entry of allergens.
Oily (O) skin is characterized by adequate or elevated sebum production. Sebum is a lipid-filled occlusive
moisturizing substance that coats the surface of the skin. The occlusion caused by sebum leads to prevention of
water evaporation (decreased TEWL) and entry of irritants into the skin. In other words, increased sebum pro-
duction can mask an underlying defect in the skin barrier. For this reason, combination skin does not exist in the
Baumann Skin Typing System. If the skin barrier is intact and the skin has a normal level of sebum function, the
skin is considered an oily skin type. If the skin barrier is not intact but the skin produces enough oil to provide
occlusion sufficient to prevent TEWL, then the skin is considered an oily skin type. If the skin does not have
enough sebum to prevent water evaporation and the skin barrier is impaired, the skin is a dry type.
Sensitive (S) skin can be subdivided into 4 subtypes, each characterized by inflammation. The 4 sensitive skin
types are: acne (pimples), rosacea (redness), burning/stinging, or allergic. Patients often exhibit several types of
sensitive skin. For instance, a patient who has frequent rashes to skin care and develops pimples would have the
acne, allergic subtypes of sensitive skin. It is important to distinguish the type of sensitive skin because they
each require different kinds of cosmeceutical ingredients. The BSTI questionnaire identifies which sensitive skin
subtypes the patient has by adding a number to the end of the 4 letters. For example, an oily, sensitive (acne),
pigmented, wrinkle-prone patient would be designated OSPW1, while an OSPW type with rosacea would be
designated OSPW2. For simplicity, these could also be designated as OSPW Acne Type or OSPW Rosacea
Type. In some cases, the patient may have more than one type of sensitivity. For example, an OSPW who exhi-
bits both acne and rosacea would be designated as an OSPW12 or as an OSPW Acne and Rosacea Type.
Resistant (R) skin types rarely suffer the four forms of inflammation described above and can tolerate a larger
variety of products and procedures. They often require stronger products and procedures to see significant re-
sults.
Pigmented (P) skin types in the Baumann Skin Typing System have uneven skin tone due to overactive me-
lanocytes. The “P” designation is not an indicator of ethnicity, but rather is an indicator that the skin needs ligh-
tening or brightening agents to even the skin tone. In the Baumann Skin Typing System, the pigmented skin
types have melasma, postinflammatory hyperpigmentation, or solar lentigos.
Non-pigmented (N) skin types in the Baumann Skin Typing System have an even skin tone and do not require
skin-lightening ingredients. A dark-skinned individual with even skin tone would be designated as an “N” skin
type. A patient with freckles that they do not want to remove would be designated a “N” type because skin ligh-
tening is not desired. For this reason, the N vs P designation is both objective and subjective and depends on the
patient’s desired outcome.
Wrinkle-prone (W) skin types have lifestyle habits such as cigarette smoking, sun exposure, and tanning bed
use that increase their risk for skin aging. Wrinkle-prone types should use aging prevention strategies that in-
clude daily sunscreen, retinoids, and antioxidants including ascorbic acid. Identifying these risk factors at a
younger age will help begin prevention strategies sooner, which may help preserve the skin’s strength, thickness
and elasticity.
Tight (T) skin types are usually below 25 years old and do not have a history of sun exposure, smoking, and
other lifestyle factors that make them more susceptible to skin aging. Although this skin type does not require
antiaging ingredients, daily SPF is always recommended to minimize risk factors for skin aging and skin cancer.
Teenagers with acne or young people with eczema fall into the T category.
L. Baumann
38
5. Using the 16 Facial Skin Phenotypes to Prescribe a Skin Care Regimen
Combination of the four parameters described above results in 16 skin phenotypes known as the “Baumann Skin
Types®,” which are designated by four letters and a corresponding color and number (Figure 1 and Figure 2).
Using this nomenclature allows physicians to use a standardized methodology that takes into account all four of
the skin parameters, each of which contributes to the patient’s skin phenotype and needs. Using this skin typing
system is preferable to a disease-based nomenclature as illustrated by this example of a DSPW patient:
A patient with dry, sensitive, pigmented, and wrinkle-prone skin presents to the dermatologist. Normal
standard of care would lead to a diagnosis as an “acne patient” and treatment with a combination of anti-
biotics, benzoyl peroxide, and retinoids. Antibiotics and benzoyl peroxide decrease the bacterial levels of
Propionibacterium acnes while retinoids affect Toll-like 2 receptors and promote desquamation of retained
keratinocytes. Using antibiotics, retinoids, and benzoyl peroxide is the standard of care for acne patients.
However, the DSPT patient will likely respond poorly to this routine acne regimen. The defect in the skin
barrier will allow increased penetration of the irritating benzoyl peroxide and retinoids resulting in dry-
ness, inflammation, and scaling that may lead to postinflammatory hyperpigmentation. This poor response
can lead to noncompliance with the acne medications and a poor outcome in which the patient is worse off
than at the outset because now they have acne, dermatitis, and postinflammatory hyperpigmentation.
What went wrong? By diagnosing this individual as an “acne patient,” the increased tendency of postin-
flammatory hyperpigmentation, inflammation, propensity to wrinkle and the impaired skin barrier went
unconsidered and undiagnosed. It is routine for doctors—and promoted by insurance regulations—to as-
sign a single diagnosis to a patient instead of combining diagnoses. In this case, the patient suffered from
three underlying issues: risk of dyschromia, xerosis, and acne, which are considered discrete or indepen-
dent phenomena. The patient would have an improved outcome if these three disorders were considered
together as part of a distinct skin type known as DSPW 1 (Acne type).
The DSPW patient has an impaired skin barrier, which allows increased penetration of ingredients into the
dermis due to a decrease of ceramides, fatty acids, and cholesterol in the lipid bilayer surrounding the ke-
ratinocytes. The impaired skin barrier seen in the “D” skin type would permit increased penetration of in-
gredients such as benzoyl peroxide and topical retinoids, which yields an increase in the incidence of ad-
verse effects from these ingredients (redness, peeling, skin stinging, and burning). The irritation from both
benzoyl peroxide and retinoids is known to be dose dependent [7] [8]. Retinoids promote inflammation
through several mechanisms, one of which impacts cytokine expression [9]. “S” skin types are most sus-
ceptible to develop inflammation at a certain dose of medication because of increased activity of internal
pro-inflammatory factors such as neutrophil attracting cytokines [10]. This leaves them more vulnerable to
inflammation from topically applied products in a dose-dependent manner. Combining the skin types “D”
and “S” results in an exaggerated inflammatory response to an increased dose of a chemical agent, greatly
increasing the likelihood of an adverse event. Because this patient also has a “P” designation, his melano-
cytes have increased tyrosinase activity resulting in elevated production of melanin by melanocytes. In other
words, he will develop hyperpigmentation after inflammation due to activation of melanocytes [11]. The fact
that this patient is wrinkle prone should also be considered when prescribing a skin care regimen, so addi-
tion of antioxidants and sunscreen is crucial to counteract the pro-oxidant effects of benzoyl peroxide.
Taking all four of the parameters into consideration when prescribing a skin care regimen will improve out-
comes because all of the important variables are taken into account. In addition, giving clear instructions to pa-
tients helps increase compliance, which also improves clinical outcomes and skin health.
6. Incidence of the Individual Baumann Skin Types
Over the last 10 years, the BSTI has been used to gather skin type data from around the world. It has been
shown that the Baumann Skin Types are not equally distributed; some are much more common than others. In
data collected from 52,862 patients (in doctors’ offices and online to include people that have sought medical
care and people who have not sought medical care), it was found that 65% of people were oily skin types while
35% were dry types (Table 1). The most common skin types varied only slightly between patients that took the
quiz online and those that completed the questionnaire in their doctor’s office. This indicates that the prevalence
of skin types seen in the doctor’s office is similar to that in the general population [12]. In addition, comparison
L. Baumann
39
of data gathered in China, Korea, and the US (Table 2 and Table 3) did not show a significant difference in oily
vs dry skin type prevalence between Asian and Caucasian skin types [13]. Although skin lightening products sell
more in Asia than in the US, Table 4 and Table 5 show that the incidence of pigmented (uneven skin tone)
types is not very different between Asians and other ethnicities.
Table 1. Combined data from physicians’ offices (both dermatology and
plastic surgery) and from the website SkinTypeSolutions.com show that oily
skin types were more common than dry types.
Baumann Count % to total
Skin type
Oily 34,203 65%
Dry 18,659 35%
Total 52,862
Table 2. Data from physician’s offices in US in 2006.
Skin type Count % to total
Dry 413
49%
Oily 431 51%
Total 844
Table 3. Data from physicians’ offices in China and Korea in 2006 (“Un-
known” did not complete the questionnaire).
Baumannskin type Count % to total
Dry 164 57.7%
Oily 116 40.8%
Unknown 4 1.41%
Total 284 99.9%
Table 4. 39% of Asians in China and Korea reported an uneven skintone.
Asians
Baumann Count % to total
Skin type
Pigmented 110 39%
Nonpigmented 170 60%
280
Table 5. All ethnicities combines reported 53% unevenness in skin tone.
All ethnicities
Baumann Count % to total
Skin type
Pigmented 27,925 53%
Nonpigmented 24,937 47%
52,862
L. Baumann
40
7. Conclusion
The Baumann Skin Typing System assigns patients to one of 16 skin types based on their answers to a validated
questionnaire [6] known as the Baumann Skin Type Indicator [14]. The questionnaire gives similar results
among all ethnicities. Using the Baumann Skin Type nomenclature improves communication between physi-
cians, scientists, researchers, aestheticians, and patients about skin care regimen efficacy and adverse events.
Because studies have demonstrated that patients cannot properly self-diagnose their skin type, the Baumann
Skin Type should be diagnosed using a validated questionnaire for that purpose [15]. The incidence of various
skin type diagnoses is similar among Americans, Koreans and Chinese using this diagnostic tool, indicating that
this tool is valid for English speaking patients in these 3 countries. The English version of the Baumann Skin
Type Indicator has been shown to be valid for English speaking patients online, and in doctors’ offices in the US,
China and Korea. It is unknown at this time if the questionnaire is valid in other translations.
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