<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root>
<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Vestnik dermatologii i venerologii</journal-id><journal-title-group><journal-title xml:lang="en">Vestnik dermatologii i venerologii</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник дерматологии и венерологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0042-4609</issn><issn publication-format="electronic">2313-6294</issn><publisher><publisher-name xml:lang="en">Rossijskoe Obschestvo Dermatovenerologov i Kosmetologov</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">16975</article-id><article-id pub-id-type="doi">10.25208/vdv16975</article-id><article-id pub-id-type="edn">AMOPIT</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>GUIDELINES FOR PRACTITIONERS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>В ПОМОЩЬ ПРАКТИЧЕСКОМУ ВРАЧУ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Pyoderma gangrenosum: the challenge of differential diagnosis in a patient with atypical localization</article-title><trans-title-group xml:lang="ru"><trans-title>Гангренозная пиодермия: проблема дифференциальной диагностики у пациента с нетипичной локализацией кожного процесса</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2482-1754</contrib-id><contrib-id contrib-id-type="spin">2500-7989</contrib-id><name-alternatives><name xml:lang="en"><surname>Olisova</surname><given-names>Olga Y.</given-names></name><name xml:lang="ru"><surname>Олисова</surname><given-names>Ольга Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Professor, Corresponding Member of the Russian Academy of Sciences</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор, член-корреспондент Российской академии наук</p></bio><email>olisovaolga@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5259-7481</contrib-id><contrib-id contrib-id-type="spin">1843-1090</contrib-id><name-alternatives><name xml:lang="en"><surname>Grabovskaya</surname><given-names>Olga V.</given-names></name><name xml:lang="ru"><surname>Грабовская</surname><given-names>Ольга Валентиновна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine), Professor</p></bio><bio xml:lang="ru"><p>канд. мед. наук, профессор</p></bio><email>olgadoctor2013@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3611-0917</contrib-id><contrib-id contrib-id-type="spin">5345-5746</contrib-id><name-alternatives><name xml:lang="en"><surname>Bobkova</surname><given-names>Anna E.</given-names></name><name xml:lang="ru"><surname>Бобкова</surname><given-names>Анна Евгеньевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>канд. мед. наук</p></bio><email>anya_bobkova98@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3007-5498</contrib-id><name-alternatives><name xml:lang="en"><surname>Glushak</surname><given-names>Valentina V.</given-names></name><name xml:lang="ru"><surname>Глушак</surname><given-names>Валентина Вадимовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD</p></bio><bio xml:lang="ru"><p>ординатор</p></bio><email>valentina.glushak@inbox.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">The First Sechenov Moscow State Medical University (Sechenov University)</institution></aff><aff><institution xml:lang="ru">Первый Московский государственный медицинский университет имени И.М. Сеченова (Сеченовский Университет)</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2026-07-14" publication-format="electronic"><day>14</day><month>07</month><year>2026</year></pub-date><pub-date date-type="pub" iso-8601-date="2026-08-27" publication-format="electronic"><day>27</day><month>08</month><year>2026</year></pub-date><volume>102</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>53</fpage><lpage>60</lpage><history><date date-type="received" iso-8601-date="2026-03-28"><day>28</day><month>03</month><year>2026</year></date><date date-type="accepted" iso-8601-date="2026-06-19"><day>19</day><month>06</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Olisova O.Y., Grabovskaya O.V., Bobkova A.E., Glushak V.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Олисова О.Ю., Грабовская О.В., Бобкова А.Е., Глушак В.В.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Olisova O.Y., Grabovskaya O.V., Bobkova A.E., Glushak V.V.</copyright-holder><copyright-holder xml:lang="ru">Олисова О.Ю., Грабовская О.В., Бобкова А.Е., Глушак В.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://vestnikdv.ru/jour/article/view/16975">https://vestnikdv.ru/jour/article/view/16975</self-uri><abstract xml:lang="en"><p>Pyoderma gangrenosum is a rare, immune-mediated skin disease that belongs to neutrophilic dermatoses. It typically affects the lower extremities, making isolated involvement of the axillary regions a significant diagnostic challenge.</p> <p>We present a clinical case of a 34-year-old patient with a nine-month history of the disease, manifested by painful ulcerative-erosive eruptions in the axillary areas. At the pre-hospital stage, pyoderma, allergic contact dermatitis, dermatophytosis, and pemphigus vegetans were incorrectly diagnosed, which is confirmed by the lack of therapeutic effect from antibacterial and antimycotic therapy. The diagnosis of pyoderma gangrenosum was verified based on the characteristic clinical presentation (multiple deep ulcerative defects with undermined edges of a bright red-pink color with a bluish tinge, the bases of the ulcers are covered with a purulent-necrotic scab) and histological examination results. Systemic glucocorticosteroid therapy (prednisolone 85 mg/day) was effective and led to regression of the lesions; however, disease recurrence occurred when the dose was reduced to 35 mg/day.</p> <p>This case underscores the critical importance of early differential diagnosis of pyoderma gangrenosum in intertriginous zones to prevent iatrogenic complications and the pathergy phenomenon.</p></abstract><trans-abstract xml:lang="ru"><p>Гангренозная пиодермия представляет собой редкое иммуноопосредованное заболевание кожи, относящееся к группе нейтрофильных дерматозов. Обычно поражаются нижние конечности, в связи с этим изолированное поражение подмышечных областей вызывает значительные трудности при диагностике.</p> <p>Представлено клиническое наблюдение пациента 34 лет с анамнезом гангренозной пиодермии, длящейся 9 мес и проявлявшейся болезненными язвенно-эрозивными высыпаниями в аксиллярных областях. На догоспитальном этапе ошибочно диагностировали пиодермию, аллергический контактный дерматит, эпидермофитию и вегетирующую пузырчатку, что подтверждается отсутствием терапевтического эффекта от проводившейся терапии антибактериальными и антимикотическими препаратами. Диагноз «гангренозная пиодермия» был верифицирован на основании характерной клинической картины (множественные глубокие язвенные дефекты с подрытыми краями яркого красно-розового цвета с синюшным оттенком, дно язв покрыто гнойно-некротическим струпом) и результатов гистологического исследования. Терапия системными глюкокортикоидами (преднизолон в дозе 85 мг/сут) была эффективна и привела к регрессу элементов, однако при снижении дозы до 35 мг/сут наступил рецидив заболевания.</p> <p>Представленный клинический случай подчёркивает критическую важность ранней дифференциальной диагностики гангренозной пиодермии интертригинозных зон для предотвращения ятрогенных осложнений и феномена патергии.</p></trans-abstract><kwd-group xml:lang="en"><kwd>pyoderma gangrenosum</kwd><kwd>neutrophilic dermatoses</kwd><kwd>differential diagnosis</kwd><kwd>hidradenitis suppurativa</kwd><kwd>immunosuppressive therapy</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>гангренозная пиодермия</kwd><kwd>нейтрофильные дерматозы</kwd><kwd>дифференциальная диагностика</kwd><kwd>гнойный гидраденит</kwd><kwd>иммуносупрессивная терапия</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Олисова О.Ю., Теплюк Н.П. Иллюстрированное руководство по дерматологии. Москва: ГЭОТАР-Медиа; 2022. С. 254–257. [Olisova OYu, Teplyuk NP. Illyustrirovannoe rukovodstvo po dermatologii. Moscow: GEOTAR-Media; 2022. P. 254–257. (In Russ.)]</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Teplyuk NP, Grabovskaya OV, Kusraeva DT, Varshavsky VA. Pyoderma gangrenosum: examination and treatment experience. Russian Journal of Skin and Venereal Diseases. 2022;25(1):61–72. doi: 10.17816/dv105685 EDN: DKLOSE</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Masyukova SA, Mordovtseva VV, Ilyina IV, et al. Hidradenitis suppurativa: clinic and diagnostics (part 2). Russian Journal of Skin and Venereal Diseases. 2016;19(3):154–158. doi: 10.18821/1560-9588-2016-19-3-154-158 EDN: WBZSNZ</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Burova SA, Borodulina KS. Hydradenitis suppurativa: issues of pathogenesis, rating scales, treatment. Overview (part 2). Russian Journal of Clinical Dermatology and Venereology. 2019;18(3):265–269. doi: 10.17116/klinderma201918031265 EDN: PDRMJV</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Olisova OYu, Grabovskaya OV, Teplyuk NP, et al. On the issue of the syndromic forms of pyoderma gangrenosum. Russian Journal of Skin and Venereal Diseases. 2024;27(4):419–434. doi: 10.17816/dv629665 EDN: AECPTS</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Alavi A, French LE, Davis MD, et al. Pyoderma gangrenosum: an update on pathophysiology, diagnosis and treatment. Am J Clin Dermatol. 2017;18(3):355–372. doi: 10.1007/s40257-017-0251-7 EDN: AJIPSV</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Ruocco E, Sangiuliano S, Gravina AG, et al. Pyoderma gangrenosum: an updated review. J Eur Acad Dermatol Venereol. 2009;23(9):1008–1017. doi: 10.1111/j.1468-3083.2009.03199.x</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>Grabovskaya OV, Teplyuk NP, Kusraeva DT, Varshavsky VA. Clinical case of pyoderma gangrenosum. Russian Journal of Skin and Venereal Diseases. 2019;22(5-6):161–166. doi: 10.17816/dv42953 EDN: ZXXFVF</mixed-citation></ref><ref id="B9"><label>9.</label><mixed-citation>Teplyuk NP, Grabovskaya OV, Kusraeva DT, et al. Successful treatment of pyoderma gangrenosum in a patient winh ulcerative colitis and COVID-19 infection: case report. Russian Journal of Skin and Venereal Diseases. 2022;25(5):373–380. doi: 10.17816/dv111864 EDN: UZQVSP</mixed-citation></ref><ref id="B10"><label>10.</label><mixed-citation>Ahronowitz I, Harp J, Shinkai K. Etiology and management of pyoderma gangrenosum: a comprehensive review. Am J Clin Dermatol. 2012;13(3):191–211. doi: 10.2165/11595240-000000000-00000 EDN: LGJCYK</mixed-citation></ref><ref id="B11"><label>11.</label><mixed-citation>García-Rabasco AE, Esteve-Martínez A, Zaragoza-Ninet V, et al. Pyoderma gangrenosum associated with hidradenitis suppurativa: a case report and review of the literature. Actas Dermosifiliogr. 2010;101(8):717–721. [In Spanish]. doi: 10.1016/j.ad.2010.06.008</mixed-citation></ref><ref id="B12"><label>12.</label><mixed-citation>Niv D, Ramirez JA, Fivenson DP. Pyoderma gangrenosum, acne, and hidradenitis suppurativa (PASH) syndrome with recurrent vasculitis. JAAD Case Rep. 2017;3(1):70–73. doi: 10.1016/j.jdcr.2016.11.006</mixed-citation></ref><ref id="B13"><label>13.</label><mixed-citation>Łyko M, Ryguła A, Kowalski M, et al. The pathophysiology and treatment of pyoderma gangrenosum-current options and new perspectives. Int J Mol Sci. 2024;25(4):2440. doi: 10.3390/ijms25042440 EDN: DKYKGQ</mixed-citation></ref><ref id="B14"><label>14.</label><mixed-citation>Warner BW. Peristomal pyoderma gangrenosum. Gastroenterology. 2000;119(3):873–874. doi: 10.1016/s0016-5085(00)70115-6</mixed-citation></ref><ref id="B15"><label>15.</label><mixed-citation>Shakir L, Javeed A, Ashraf M, Riaz A. Metronidazole and the immune system. Pharmazie. 2011;66(6):393–398. doi: 10.1691/ph.2011.0790 EDN: OKWYZJ</mixed-citation></ref><ref id="B16"><label>16.</label><mixed-citation>Pradhan S, Madke B, Kabra P, Singh AL. Anti-inflammatory and immunomodulatory effects of antibiotics and their use in dermatology. Indian J Dermatol. 2016;61(5):469–481. doi: 10.4103/0019-5154.190105</mixed-citation></ref></ref-list></back></article>
