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  1. Article ; Online: A narrative review of the impact of ultraviolet radiation and sunscreen on the skin microbiome.

    Grant, Garett J / Kohli, Indermeet / Mohammad, Tasneem F

    Photodermatology, photoimmunology & photomedicine

    2024  Volume 40, Issue 1, Page(s) e12943

    Abstract: Background: The human skin microbiome is a dynamic ecosystem that plays an important role in skin health. The skin microbiome has been implicated in numerous diseases, and our knowledge surrounding it continues to evolve. A better understanding of the ... ...

    Abstract Background: The human skin microbiome is a dynamic ecosystem that plays an important role in skin health. The skin microbiome has been implicated in numerous diseases, and our knowledge surrounding it continues to evolve. A better understanding of the interactions between the environment and the skin microbiome will lead to improvements in skin health.
    Methods: This article reviews the published literature surrounding the impact of ultraviolet radiation (UVR) and sunscreen on the skin microbiome.
    Results: Skin microbes are differentially impacted by UVR, and alterations in the microbiome can be detected following UVR exposure. These changes are related to direct bactericidal effects, alterations in the cutaneous metabolome, and changes in the cutaneous immune system. UV filters used in sunscreen have been shown to have bactericidal effects, and many compounds used in sunscreen emulsions can also negatively impact cutaneous microbes.
    Conclusion: A healthy microbiome has been shown to produce compounds that help protect the skin from UVR, and sunscreen has the potential to reduce the diversity of the skin microbiome. This indicates that designing sunscreen products that both provide protection against UVR and preserve the skin microbiome may offer additional benefits to skin health when compared with traditional sunscreen products.
    MeSH term(s) Humans ; Sunscreening Agents/pharmacology ; Ultraviolet Rays/adverse effects ; Ecosystem ; Skin/radiation effects
    Chemical Substances Sunscreening Agents
    Language English
    Publishing date 2024-01-30
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1028855-7
    ISSN 1600-0781 ; 0108-9684 ; 0905-4383
    ISSN (online) 1600-0781
    ISSN 0108-9684 ; 0905-4383
    DOI 10.1111/phpp.12943
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Blue light and the skin on social media: An analysis of posts on exposure and photoprotection strategies.

    Ceresnie, Marissa S / Patel, Jay / Tvedten, Erika J / Kohli, Indermeet / Mohammad, Tasneem F

    Photodermatology, photoimmunology & photomedicine

    2023  Volume 39, Issue 5, Page(s) 543–545

    MeSH term(s) Humans ; Social Media ; Skin ; Light
    Language English
    Publishing date 2023-06-29
    Publishing country England
    Document type Letter
    ZDB-ID 1028855-7
    ISSN 1600-0781 ; 0108-9684 ; 0905-4383
    ISSN (online) 1600-0781
    ISSN 0108-9684 ; 0905-4383
    DOI 10.1111/phpp.12896
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Objective assessment of color match for a universal tinted sunscreen on individuals with skin of color: A pilot study.

    Kohli, Indermeet / Ceresnie, Marissa S / Teklehaimanot, Fayven / Lane, Brittany N / Huggins, Richard H / Hamzavi, Iltefat H / Lim, Henry W / Mohammad, Tasneem F

    Photodermatology, photoimmunology & photomedicine

    2024  Volume 40, Issue 1, Page(s) e12941

    MeSH term(s) Humans ; Sunscreening Agents ; Pilot Projects ; Skin Pigmentation ; Skin ; Color
    Chemical Substances Sunscreening Agents
    Language English
    Publishing date 2024-01-30
    Publishing country England
    Document type Journal Article
    ZDB-ID 1028855-7
    ISSN 1600-0781 ; 0108-9684 ; 0905-4383
    ISSN (online) 1600-0781
    ISSN 0108-9684 ; 0905-4383
    DOI 10.1111/phpp.12941
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  4. Article ; Online: Photobiomodulation CME part II: Clinical applications in dermatology.

    Mineroff, Jessica / Maghfour, Jalal / Ozog, David M / Lim, Henry W / Kohli, Indermeet / Jagdeo, Jared

    Journal of the American Academy of Dermatology

    2024  

    Abstract: Photobiomodulation (PBM) is an emerging treatment modality in dermatology with increasing office and home-based use. PBM is the use of various light sources in the red light (620-700 nm) and near-infrared (700-1440 nm) spectrum as a form of light therapy. ...

    Abstract Photobiomodulation (PBM) is an emerging treatment modality in dermatology with increasing office and home-based use. PBM is the use of various light sources in the red light (620-700 nm) and near-infrared (700-1440 nm) spectrum as a form of light therapy. PBM is often administered through low-level lasers or light-emitting diodes. Studies show that PBM can be used effectively to treat conditions secondary to cancer therapies, alopecia, ulcers, herpes simplex virus, acne, skin rejuvenation, wounds, and scars. PBM offers patients many benefits compared to other treatments. It is noninvasive, cost-effective, convenient for patients, and offers a favorable safety profile. PBM can be used as an alternative or adjuvant to other treatment modalities including pharmacotherapy. It is important for dermatologists to gain a better clinical understanding of PBM for in-office administration and to counsel patients on proper application for home-use devices to best manage safety and expectations as this technology develops. PBM wavelengths can induce varied biological effects in diverse skin types, races, and ethnicities; therefore, it is also important for dermatologists to properly counsel their skin of color patients who undergo PBM treatments. Future clinical trials are necessary to produce standardized recommendations across conditions and skin types.
    Language English
    Publishing date 2024-02-01
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 603641-7
    ISSN 1097-6787 ; 0190-9622
    ISSN (online) 1097-6787
    ISSN 0190-9622
    DOI 10.1016/j.jaad.2023.10.074
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Photobiomodulation CME Part I: Overview and Mechanism of Action.

    Maghfour, Jalal / Ozog, David M / Mineroff, Jessica / Jagdeo, Jared / Kohli, Indermeet / Lim, Henry W

    Journal of the American Academy of Dermatology

    2024  

    Abstract: Photobiomodulation (PBM), previously known as low-level laser light therapy, represents a non-invasive form of phototherapy that utilizes wavelengths in the red light (RL, 620-700 nm) portion of the visible light (VL, 400-700 nm) spectrum and the near- ... ...

    Abstract Photobiomodulation (PBM), previously known as low-level laser light therapy, represents a non-invasive form of phototherapy that utilizes wavelengths in the red light (RL, 620-700 nm) portion of the visible light (VL, 400-700 nm) spectrum and the near-infrared (NIR, 700-1440 nm) spectrum. PBM is a promising and increasingly used therapy for the treatment of various dermatologic and non-dermatologic conditions. Photons from RL and NIR are absorbed by endogenous photoreceptors including mitochondrial cytochrome C oxidase (COX). Activation of COX leads to the following changes: modulation of mitochondrial adenosine triphosphate (ATP), generation of reactive oxygen species (ROS), and alterations in intracellular calcium levels. The associated modulation of ATP, ROS and calcium levels promotes the activation of various signaling pathways (e.g., insulin-like growth factors, phosphoinositide 3-kinase pathways), which contribute to downstream effects on cellular proliferation, migration and differentiation. Effective PBM therapy is dependent on treatment parameters (e.g., fluence, treatment duration and output power). PBM is generally well-tolerated and safe with erythema being the most common and self-limiting adverse cutaneous effect.
    Language English
    Publishing date 2024-02-01
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 603641-7
    ISSN 1097-6787 ; 0190-9622
    ISSN (online) 1097-6787
    ISSN 0190-9622
    DOI 10.1016/j.jaad.2023.10.073
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  6. Article ; Online: Visible Light and the Skin.

    Ezekwe, Nneamaka / Maghfour, Jalal / Kohli, Indermeet

    Photochemistry and photobiology

    2022  Volume 98, Issue 6, Page(s) 1264–1269

    Abstract: Visible light (VL, 400-700 nm) was previously regarded as nonsignificant with minimal to no photobiologic effects on the skin. Recent studies have demonstrated that in dark-skinned individuals (skin phototypes IV-VI), VL can induce more intense and ... ...

    Abstract Visible light (VL, 400-700 nm) was previously regarded as nonsignificant with minimal to no photobiologic effects on the skin. Recent studies have demonstrated that in dark-skinned individuals (skin phototypes IV-VI), VL can induce more intense and longer lasting pigmentation compared to ultraviolet A1 (UVA1, 340-400 nm). Additionally, long wavelength UVA1 (370-400 nm) has been shown to potentiate these effects of VL. The combination of VL and UVA1 (VL + UVA1, 370-700 nm) was also able to induce erythema in light-skinned individuals (skin phototypes I-III), which is a novel finding since the erythemogenic spectrum of sunlight has primarily been attributed to ultraviolet B (UVB, 290-320 nm) and short wavelength UVA2 (320-340 nm) only. Although biologic effects of VL + UVA1 have been established, there are no guidelines in any country to test for photoprotection against this waveband. This invited perspective aims to present the evolution of knowledge of photobiologic effects of VL, associated phototesting methodologies, and current position on VL photoprotection.
    MeSH term(s) Humans ; Skin Pigmentation ; Ultraviolet Rays ; Light ; Skin ; Erythema
    Language English
    Publishing date 2022-05-10
    Publishing country United States
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 123540-0
    ISSN 1751-1097 ; 0031-8655
    ISSN (online) 1751-1097
    ISSN 0031-8655
    DOI 10.1111/php.13634
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Optimisation of skin phototype classification.

    Lim, Sophie S / Mohammad, Tasneem F / Kohli, Indermeet / Hamzavi, Iltefat / Rodrigues, Michelle

    Pigment cell & melanoma research

    2023  Volume 36, Issue 6, Page(s) 468–471

    Abstract: Understanding individuals' skin pigmentation and photosensitivity is important in judging risk of skin cancer and response to certain treatment modalities. However, individuals with darkly pigmented skin are poorly represented in the widely used ... ...

    Abstract Understanding individuals' skin pigmentation and photosensitivity is important in judging risk of skin cancer and response to certain treatment modalities. However, individuals with darkly pigmented skin are poorly represented in the widely used Fitzpatrick skin phototype (FST) system. Moreover, the FST system is prone to misuse, as it relies on subjective patient and clinician assessment of skin type, and does not clearly differentiate pigmentation from photosensitivity. By evaluating the key literature surrounding the FST system, its criticisms and proposed alternatives, this review serves to understand how skin phototype classification can be optimised.
    MeSH term(s) Humans ; Skin ; Photosensitivity Disorders ; Skin Pigmentation ; Skin Neoplasms/genetics ; Pigmentation Disorders
    Language English
    Publishing date 2023-08-07
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2409570-9
    ISSN 1755-148X ; 1600-0749 ; 0893-5785 ; 1755-1471
    ISSN (online) 1755-148X ; 1600-0749
    ISSN 0893-5785 ; 1755-1471
    DOI 10.1111/pcmr.13110
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  8. Article ; Online: The cutaneous effects of blue light from electronic devices: a systematic review with health hazard identification.

    Ceresnie, Marissa S / Patel, Jay / Lim, Henry W / Kohli, Indermeet

    Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology

    2022  Volume 22, Issue 2, Page(s) 457–464

    Abstract: The biologic effects of visible light, particularly blue light, on the skin at doses and irradiances representative of sunlight have been established. Recent research studies investigated the effects of blue light (BL) from electronic screen devices; ... ...

    Abstract The biologic effects of visible light, particularly blue light, on the skin at doses and irradiances representative of sunlight have been established. Recent research studies investigated the effects of blue light (BL) from electronic screen devices; however, it is unclear if the evidence can be generalized to real life. The aim of this systematic review was to evaluate available evidence regarding clinical effects of BL emitted from electronic devices on human skin using the framework established by the Office of Health Assessment and Translation (OHAT). A systematic literature search was conducted by two librarians in Ovid MEDLINE, Embase.com, and Web of Science for relevant articles published from 1946 to March 2022. In vitro and in vivo studies that investigated the effects of BL from electronic devices on skin were included. From the 87 articles gathered from database searches and 1 article identified from citation search, only 9 met the inclusion criteria (6 in vitro and 3 in vivo studies). Human and animal literature with the highest level of evidence ratings were considered with mechanistic data to form one of five human hazard identifications for each outcome category using the OHAT protocol: (1) known, (2) presumed, (3) suspected, (4) not classifiable, or (5) not identified to be a hazard to humans. Literature-based evidence integration did not identify exposure to BL from electronic devices as a hazard to skin pigmentation, redness, yellowness, or melasma exacerbation. Exposure to BL from electronic devices was not classified as a skin photoaging hazard. Low confidence in representative exposure characterization drove high OHAT risk-of-bias ratings for the majority of included studies. While these conclusions hold true for the limited existing data, a larger number of future studies with high-confidence evidence are needed to verify and strengthen hazard identification conclusions.
    MeSH term(s) Animals ; Humans ; Light ; Skin
    Language English
    Publishing date 2022-10-16
    Publishing country England
    Document type Systematic Review ; Journal Article ; Review
    ZDB-ID 2072584-X
    ISSN 1474-9092 ; 1474-905X
    ISSN (online) 1474-9092
    ISSN 1474-905X
    DOI 10.1007/s43630-022-00318-9
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  9. Article ; Online: Changes in Google search for "sunburn" during the COVID-19 pandemic.

    Boothby-Shoemaker, Wyatt / Lim, Henry W / Kohli, Indermeet / Ozog, David M

    Photodermatology, photoimmunology & photomedicine

    2021  Volume 37, Issue 5, Page(s) 474–475

    MeSH term(s) COVID-19/epidemiology ; COVID-19/prevention & control ; Humans ; Incidence ; SARS-CoV-2 ; Search Engine/statistics & numerical data ; Sunburn/epidemiology ; United States/epidemiology
    Language English
    Publishing date 2021-04-17
    Publishing country England
    Document type Letter
    ZDB-ID 1028855-7
    ISSN 1600-0781 ; 0108-9684 ; 0905-4383
    ISSN (online) 1600-0781
    ISSN 0108-9684 ; 0905-4383
    DOI 10.1111/phpp.12684
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  10. Article ; Online: Individual Typology Angle and Fitzpatrick Skin Phototypes are Not Equivalent in Photodermatology.

    Osto, Muhammad / Hamzavi, Iltefat H / Lim, Henry W / Kohli, Indermeet

    Photochemistry and photobiology

    2021  Volume 98, Issue 1, Page(s) 127–129

    Abstract: Individual typology angle (ITA) measures constitutive pigmentation while skin phototypes (SPT) categories are based on sun reactiveness. However, the association between the two, ITA and SPT, is yet to be established. Since both systems provide six ... ...

    Abstract Individual typology angle (ITA) measures constitutive pigmentation while skin phototypes (SPT) categories are based on sun reactiveness. However, the association between the two, ITA and SPT, is yet to be established. Since both systems provide six categories, recent studies have used ITA classifications as synonymous to SPT. The results of this study indicate that these cannot be utilized interchangeably. In conclusion, poor correlation between the six objective individual typology angle categories and the subjective Fitzpatrick skin phototype categories was established along with highlighting ITAs potential in photobiologic studies and objective standardization of skin type classifications.
    MeSH term(s) Humans ; Photobiology ; Pigmentation Disorders ; Skin ; Skin Pigmentation
    Language English
    Publishing date 2021-11-26
    Publishing country United States
    Document type Letter
    ZDB-ID 123540-0
    ISSN 1751-1097 ; 0031-8655
    ISSN (online) 1751-1097
    ISSN 0031-8655
    DOI 10.1111/php.13562
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