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Intensive pulsating light (IPL) is used as an effective treatment, and current guidance favors combining subjective clinician grading with objective imaging analysis. In this study, 20 patients received three polychromatic light sessions (515–1200 nm) at 21-day intervals. 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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.  \n1 Department of Practical Cosmetology and Skin Diagnostics, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, 41-200 Sosnowiec, Poland  \n2 Clinical Department of Dermatology, Department of Internal Medicine, Dermatology and Allergology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia in Katowice, 41-800 Zabrze, Poland  \n3 Clinical Department of Dermatology, Faculty of Medical Sciences in Katowice, Medical University of Silesia in Katowice, 40-752 Katowice, Poland  \n4 Department of Basic Biomedical Science, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, 41-200 Sosnowiec, Poland; [swilczynski@sum.edu.pl](swilczynski@sum.edu.pl) (S.W.)  \n* Correspondence: [adeda@sum.edu.pl](adeda@sum.edu.pl); Tel.: +48-500233457  \nAbstract  \nBackground: Rosacea is a chronic facial skin disease in which persistent erythema is a significant clinical problem, often resistant to standard therapies. Intensive pulsating light (IPL) has become a recognised and effective method of treating erythema and telangiectasia. The latest recommendations emphasise the advantage of combining subjective clinical assessments with objective imaging analyses in monitoring therapy effects. Methods: A total of 20 patients with rosacea qualified for this study. They were subjected to three polychromatic light procedures (Lumecca, Inmode; wavelength of 515–1200 nm) at 21-day intervals. The skin condition was documented photographically, and the degree of erythema was assessed on the basis of the Clinician Erythema Assessment (CEA) scale and objective analysis of the skin texture, using the parameters of contrast and homogeneity of the grey level co-occurrence matrix (GLCM) . Results: A series of three polychromatic light treatments yielded a significant clinical improvement in all patients. The mean CEA value decreased by 61.11%, whereas the GLCM contrast in all the analysed facial areas dropped by about 17%, and homogeneity increased by 4–5% . The effects persisted for at least three months after the treatments. A high correlation of CEA scale results with GLCM parameters (R = 0.81–0.94 for contrast; R = −0.77 to −0.83 for homogeneity) was observed. Conclusions: Three polychromatic light treatments proved tobe a very effective method of reducing erythema in rosacea, confirmed by both clinical evaluation and objective imaging analysis. The effects of therapy were durable and clear. Integration of the subjective method (CEA) with GLCM analysis can be a path for future research and clinical practice in the assessment of erythematous skin lesions.  \nKeywords: rosacea; Intense Pulsed Light (IPL); erythema reduction; Grey Level Co-Occurrence Matrix (GLCM); Clinician Erythema Assessment (CEA)  \n1. Introduction  \nRosacea is a chronic, recurrent, inflammatory skin disease, mainly affecting central parts of the face. It is characterised by recurrent or fixed erythema, telangiectasias, papulae, pustulae and hypertrophic changes. Secondary symptoms such as itching, burning or  \nstinging are often observed in patients with rosacea. Erythema, both temporary (with redness) and fixed, is a clinical feature of the most common subtype, namely erythematotelangiectatic rosacea. It is also characteristic of a papulopustular variant and can accompany hypertrophic changes. Rosacea, du","cbCaifmhBFWtr5fK","https://ap.wps.com/l/cbCaifmhBFWtr5fK","pdf",4359081,15,"English","# Abstract\n# 1. Introduction","[{\"question\":\"What treatment was evaluated in rosacea patients?\",\"answer\":\"The study evaluated three polychromatic light procedures using devices labeled Lumecca and Inmode with wavelengths of 515–1200 nm.\"},{\"question\":\"How was erythema reduction measured?\",\"answer\":\"Erythema was assessed using the Clinician Erythema Assessment (CEA) scale and objective imaging analysis based on grey level co-occurrence matrix (GLCM) parameters, including contrast and homogeneity.\"},{\"question\":\"How long did the treatment effects last?\",\"answer\":\"The effects persisted for at least three months after the polychromatic light treatments.\"}]","Assessment of the Degree of Erythema Reduction in Rosacea After Polychromatic Light Treatments | PDF",1790761820,38]