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  • Demodectic Rosacea

    Demodectic Rosacea is a rosacea variant, just as valid a variant as Granulomatous Rosacea.

    Image of Demodex Folliculorum courtesy of National Geographic Demodex Folliculorum [1]

    The RRDi is the only non profit organization for rosacea that has officially recognized Demodectic Rosacea as a variant of rosacea. "Recently human primary demodicosis has been recognized as a primary disease sui generis and a clinical classification has been proposed. A secondary form of human demodicosis is mainly associated with systemic or local immunosuppression." [2] This is referring to a paper published in 2014 "to classify human demodicosis into a primary form and a secondary form." [3] While acknowledging the work of Dr. Chen and Dr. Plewig, whether you refer to demodicosis or demodectic rosacea we are referring to the same condition. The term 'demodectic rosacea' was coined by Dr. Plewig in an email to the RRDi on March 2, 2007 where Dr. Plewig wrote, "Concerning your questiones, demodicosis can be a disease by itself and thus being independent of rosacea. Or demodex mites heavily colonize pre-existing rosacea and thus lead to demodectic rosacea ( rosaceiform dermatosis). This is a rather complicated issue. Rosacea is usually diagnosed by inspection [of] the eye. Laboratory tests are rarely needed, for instance in gram-negative rosacea, where one needs bacteriology. The same is true for demodectic rosacea, where one has to demonstrate the mites in great numbers." [4] 

    Current concepts on rosacea is a video presentation by the Charles Institute of Dermatology, University College Dublin with Frank Powell, MD who interviews Fabienne Fortan, MD, Université libre de Bruxelles, Belgium explaining demodectic rosacea:

    Demodetic Rosacea has a long history of controversy which continues to this day. For example, note the following quote:
    "From these and other statements it is seen that in suggesting the thought that these minute forms of life are etiological factors in even some of the phases of acneform diseases, I shall be but little in accord with the highest authorities. In antagonism to these views, I may say that the results of my observations appear to indicate a close relationship of the parasites with the diseased condition."
    Demodex Folliculorum in Diseased Conditions of the Human Face
    Proceedings of the American Society of Microscopists, Vol. 8, 1886, page 123, Published by: Wiley-Blackwell

    For a comprehensive article on demodectic rosacea and why it is considered a rosacea variant click here.

    Dr. Leyda Bowes discusses demodectic rosacea (demodicosis) in this short video: 

     

    If your dermatologist dismisses demodectic rosacea you might refer him to this page, the Demodex Mite Videos available for viewing as well as this comprehensive article and comprehensive list of medical papers on this subject

    End Notes

    [1] Image of Demodex Folliculorum courtesy of National Geographic - by Darlyne A. Murawski

    [2] Iran J Parasitol. 2017 Jan-Mar; 12(1): 12–21.
    PMCID: PMC5522688
    Human Permanent Ectoparasites; Recent Advances on Biology and Clinical Significance of Demodex Mites: Narrative Review Article
    Dorota LITWIN,  WenChieh CHEN, Ewa DZIKA, and Joanna KORYCIŃSKA

    [3] Br J Dermatol. 2014 Jun;170(6):1219-25. doi: 10.1111/bjd.12850.
    Human demodicosis: revisit and a proposed classification.
    Chen W, Plewig G.

    [4] Read end note 7 in the article, Demodectic Rosacea [Variant]

  • Posts

    • Related Articles Role of serum 25-hydroxyvitamin D levels and vitamin D receptor gene polymorphisms in patients with rosacea: a case-control study. Clin Exp Dermatol. 2018 Sep 23;: Authors: Akdogan N, Alli N, Incel Uysal P, Candar T Abstract
      BACKGROUND: Vitamin D has significant effects on the immune system and thereby on the pathogenesis of rosacea. However, there is a lack of information on the vitamin D status and vitamin D receptors (VDRs) of patients with rosacea.
      AIM: To evaluate the role of vitamin D in rosacea susceptibility.
      METHODS: A case-control study was conducted, enrolling patients with rosacea and healthy controls (HCs). Five VDR gene single nucleotide polymorphisms (SNPs) (Cdx2, FokI, ApaI, BsmI and TaqI) and serum 25-hydroxyvitamin D3 [25(OH)D3 ] levels were compared between patients and HCs.
      RESULTS: The study enrolled 60 patients (M/F: 14/46) and 60 age- and sex-matched HCs (M/F: 14/46). Age (mean ± SD) was 48 ± 11 years for both groups. The serum 25(OH)D3 levels (median ± interquartile range) were higher in patients with rosacea (12.9 ± 6.8 ng/mL) than in HCs (10.5 ± 3.7 ng/mL) (P < 0.001). Subjects with high serum 25(OH)D3 levels had a 1.36-fold increased risk of rosacea (95% CI 1.17-1.58). Heterozygous and mutant ApaI polymorphisms increased rosacea risk by 5.26-fold (95% CI 1.51-18.35) and 3.69-fold (95% CI 1.19-11.48), respectively, whereas mutant TaqI polymorphisms decreased the risk by 4.69 times (95% CI 1.37-16.67). Heterozygosity for Cdx2 alleles increased rosacea risk, whereas wildtype ApaI and mutant TaqI alleles decreased it.
      CONCLUSIONS: The present study suggests that an increase in vitamin D levels may contribute to the development of rosacea. ApaI and TaqI polymorphisms, and heterozygous Cdx2, wildtype ApaI and mutant TaqI alleles were significantly associated with rosacea. These results indicate a possible role of vitamin D and VDR pathways in the pathogenesis of rosacea, although causality could not be assessed.
      PMID: 30246390 [PubMed - as supplied by publisher] {url} = URL to article
    • Global Epidemiology and Clinical Spectrum of Rosacea, Highlighting Skin of Color: Review and Clinical Practice Experience. J Am Acad Dermatol. 2018 Sep 18;: Authors: Alexis AF, Callender VD, Baldwin HE, Desai SR, Rendon MI, Taylor SC Abstract
      Among individuals with skin of color, rosacea has been reported less frequently than in those with white skin, but it is not a rare disease. In fact, rosacea may be underreported and underdiagnosed in populations with skin of color because of the difficulty of discerning erythema and telangiectasia in dark skin, as well as underestimation of the susceptibility of more highly pigmented skin to dermatologic conditions like rosacea whose triggers include sun exposure. Many people with skin of color who have rosacea may experience delayed diagnosis leading to inappropriate or inadequate treatment, greater morbidity, and uncontrolled, progressive disease with disfiguring manifestations, including phymatous rosacea. This paper reviews the epidemiology of rosacea in skin of color and highlights variations in the clinical presentation of rosacea across the diverse spectrum of patient populations affected. It presents strategies to aid in the timely diagnosis and effective treatment of rosacea in patients with skin of color, with an aim of promoting increased awareness of rosacea in these patients and reducing disparities in the management of their disease.
      PMID: 30240779 [PubMed - as supplied by publisher] {url} = URL to article
    • Full Text The four components of this treatment are: (1) Dextran sulfate is an anionic polymer of sulfated glucose [1] Dextran sulfate contains approximately 17% sulfur which is equivalent to approximately 2.3 sulfate groups per glucosyl residue. [2]  (2) 4-t-butylcyclohexanol  [BCH; TRP-regulin ®] [3] (3) pongamia oil [4] (4) hesperidin methyl chalcone [HMC] [5] Some of the products mentioned in the above post, "Avène redness-relief cosmetic products for sensitive skin prone to redness" are:  
      Eau Thermale Avène Antirougeurs Clean Redness-Relief Refreshing Cleansing Lotion
      Eau Thermale Avène Tolérance Extrême Emulsion
      Eau Thermale Avène Antirougeurs Calm Soothing Repair Mask
      Eau Thermale Avène Xeracalm A.D Lipid-Replenishing Cleansing Oil
      Eau Thermale Avène Skin Recovery Cream
      Eau Thermale Avène Cicalfate Restorative Skin Cream
      Eau Thermale Avène Extremely Gentle Cleanser Lotion
      Eau Thermale Avène Antirougeurs Dermo Cleansing Milk
      Eau Thermale Avène Antirougeurs Day Redness Relief Soothing SPF 25 Cream
      Eau Thermale Avène Antirougeurs Fort Relief Concentrate End Notes  [1] Dextran Sulfate, Sodium Salt (CAS 9011-18-1), Santa Cruz Biotechnology [2] Dextran Sulfate, Sigma Aldrich, Millipore Sigma [3] PubChem, Sigma Aldrich, ChemSpider, Paula's Choice, Safety Data Sheet, Effective treatment for sensitive skin: 4-t-butylcyclohexanol and licochalcone A [4] derived from the seeds of the Millettia pinnata tree [5] Paula's Choice, Truth in Aging, Douglas Laboratories, 
    • Effects of dextran sulfate, 4-t-butylcyclohexanol, pongamia oil and hesperidin methyl chalcone on inflammatory and vascular responses implicated in rosacea. Clin Cosmet Investig Dermatol. 2018;11:421-429 Authors: Hernandez-Pigeon H, Garidou L, Galliano MF, Delga H, Aries MF, Duplan H, Bessou-Touya S, Castex-Rizzi N Abstract
      Background: Rosacea is a chronic facial skin disorder characterized by inflammation and vascular abnormalities. The pathophysiology of rosacea involves increased activation of the capsaicin receptor, TRPV1, the vascular endothelial growth factor (VEGF) pathway, and cathelicidin LL-37, MMP-9, and KLKs. We evaluated the activity of four compounds (dextran sulfate, 4-t-butylcyclohexanol [BCH; TRP-regulin®], pongamia oil, and hesperidin methyl chalcone [HMC]) on inflammatory and vascular responses implicated in rosacea.
      Materials and methods: The anti-inflammatory activity of dextran sulfate was evaluated on PGE2 production after PMA stimulation of NCTC-2544 keratinocytes, and on normal human epidermal keratinocytes (NHEKs) after proinflammatory stimulation to mimic a rosacea environment. The anti-angiogenic activity of dextran sulfate was measured by analyzing pseudotube formation in co-cultured human microvascular endothelial cells/normal human dermal fibroblasts. HMC modulation of vascular responses and IL-8 cytokine production after SP stimulation was evaluated in human skin explants. We also assessed the effect of BCH on TRPV1 activation, and the effect of combined BCH and pongamia oil on the inflammatory response of NHEKs.
      Results: Dextran sulfate strongly and significantly inhibited PMA-induced PGE2 production, inhibited KLK5 and MMP-9 mRNA expression, and IL-8, IL-1α and VEGF production, and displayed a highly significant inhibitory effect on VEGF-induced pseudotube formation. In SP-stimulated human skin explants, HMC significantly decreased the proportion of dilated vessels, total vessel area, and IL-8 production. BCH significantly and dose-dependently inhibited TRPV1 activation, and BCH and pongamia oil inhibited CXCL1 and CXCL6 mRNA expression and IL-8 production in NHEKs. Combined BCH/pongamia oil inhibited IL-8 production synergistically.
      Conclusion: These in vitro results showed that dextran sulfate, BCH, pongamia oil and HMC, possess complementary soothing and anti-redness properties, supporting their combination in Avène redness-relief cosmetic products for sensitive skin prone to redness, and for topical adjunctive rosacea treatment.
      PMID: 30233225 [PubMed] {url} = URL to article
    • One paper links Fungal keratitis associated with ocular rosacea
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