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Acne under the armpit. It is very frequent. What to do? # Pharmacopoeia # Pharmacopoeia Rugby

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... Read moreสิวใต้รักแร้ (หรือสิวที่จักแร้) ที่เป็นๆหายๆ บางทีขึ้นเป็นก้อนอักเสบ เจ็บๆ แดงๆ แล้วแตกออกมาเป็นหนอง หลายคนจะรู้สึกว่า “กินยาแล้วก็ยุบ แต่พอผ่านไปก็กลับมาอีก” จากประสบการณ์ที่เจอคนถามบ่อยๆ สาเหตุหนึ่งที่มักถูกมองข้ามคือ “การแพ้ผลิตภัณฑ์ใต้วงแขน” โดยเฉพาะกลุ่มระงับเหงื่อ/ลดเหงื่อ เช่น aluminum chlorohydrate หรือสารน้ำหอม/แอลกอฮอล์ในโรลออนบางชนิด พอเราใช้ต่อเนื่อง ผิวระคายเคือง คัน อักเสบ รูขุมขนตันง่าย แล้วกลายเป็นสิวอักเสบหรือก้อนใต้ผิวได้ วิธีเช็กแบบง่ายๆ ที่ฉันใช้แนะนำคนรอบตัวคือ “หยุดสิ่งกระตุ้นก่อน 2–4 สัปดาห์” เลือกงดโรลออน/สเปรย์ที่สงสัยทั้งหมด แล้วเปลี่ยนเป็นสูตรอ่อนโยน (ไม่มีน้ำหอม/แอลกอฮอล์ หรือถ้าเป็นคนแพ้ง่ายมาก ลองงดระงับเหงื่อไปก่อน) ช่วงนี้เน้นทำความสะอาดด้วยสบู่อ่อนๆ ไม่ถูแรง และซับให้แห้งสนิท เพราะความอับชื้นทำให้อักเสบซ้ำง่ายมาก ถ้าตอนนี้เป็น “ตุ่มอักเสบหรือเป็นก้อน” ข้อสำคัญคืออย่าบีบเอง แม้จะเห็นหัวหนอง เพราะการบีบทำให้แผลลึกขึ้น อักเสบลาม และทิ้งรอยดำได้ง่าย ให้ประคบอุ่นวันละ 10–15 นาที ช่วยให้ระบายดีขึ้น และใส่เสื้อผ้าที่ระบายอากาศ ไม่รัดรักแร้ ลดการเสียดสี (การเสียดสี + เหงื่อ คือคู่หูที่ทำให้สิวที่รักแร้กำเริบ) อีกอย่างที่ช่วยลดเป็นซ้ำคือปรับพฤติกรรมหลังโกน/แว็กซ์ หลายคนสิวขึ้นหลังกำจัดขนเพราะรูขุมขนอักเสบ แนะนำใช้ใบมีดใหม่ โกนตามแนวขน ไม่โกนซ้ำๆ จุดเดิม และเลี่ยงทาโรลออนทันทีหลังโกนอย่างน้อย 24 ชม. ถ้ามีอาการคัน แสบ แดงมาก ให้คิดถึงการระคายเคือง/แพ้เป็นอันดับแรก แต่ถ้าก้อนเป็นบ่อยมาก เป็นไตลึก เจ็บมาก มีรูเปิด/มีหนองไหลซ้ำตำแหน่งเดิม หรือเป็นหลายจุดทั้งสองข้าง อันนี้อยากให้ไปพบแพทย์ผิวหนังเพื่อแยกโรคที่คล้ายสิว เช่น hidradenitis suppurativa (ก้อนอักเสบเรื้อรังบริเวณรักแร้) เพราะแนวทางดูแลจะต่างจากสิวทั่วไป สรุปสั้นๆ ที่ฉันใช้เป็นเช็กลิสต์: 1) หยุดผลิตภัณฑ์ใต้วงแขนที่สงสัย โดยเฉพาะสารระงับเหงื่ออย่าง aluminum chlorohydrate 2) ลดอับชื้น-เสียดสี 3) อย่าบีบก้อนเอง 4) ถ้าเป็นซ้ำหนักๆ/มีหนองบ่อย ให้พบแพทย์เพื่อวินิจฉัยให้ชัดเจน

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