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Warfarin-induced unilateral facial swelling and skin rash
  1. Timothy R Hudd1,
  2. Pirneeka Chugh2,
  3. Kathy Zaiken1,
  4. Nathan W Samuels3,
  5. Judy Cheng1
  1. 1 Pharmacy Practice, MCPHS University, Massachusetts, USA
  2. 2 Medical Writing, BGB Group, New York, USA
  3. 3 Internal Medicine, Atrius Health, Beverly, Massachusetts, USA
  1. Correspondence to Dr Timothy R Hudd, Pharmacy Practice, MCPHS University, Boston, MA 02115, USA; timothy.hudd{at}

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Allergic cutaneous reactions in patients on warfarin are rare and reported at an incidence of less than 0.1% in the literature.1 Nevertheless, various types of warfarin-induced cutaneous reactions have been reported, including vesicular, maculopapular and urticarial lesions.1 Warfarin-induced skin necrosis is a more serious dermatological condition that occurs in an estimated 1 in 10 000 patients exposed to warfarin. Red, painful plaques have been reported within 5 days of taking warfarin and may progress to haemorrhagic blisters, ulcers, and ultimately lead to skin necrosis.2 Practitioners should distinguish these more serious cutaneous reactions from less serious skin eruptions. Cutaneous reactions to oral formulations of warfarin may be due to the active ingredient, or certain excipients such as dye,3 although …

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