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Practice

Bullous hemorrhagic dermatosis

Simon F. Roy, Philippe Watson and Danielle Bouffard
CMAJ January 06, 2020 192 (1) E12; DOI: https://doi.org/10.1503/cmaj.191052
Simon F. Roy
Divisions of Pathology (Roy, Bouffard) and Dermatology (Watson), Université de Montréal, Montréal, Que.
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Philippe Watson
Divisions of Pathology (Roy, Bouffard) and Dermatology (Watson), Université de Montréal, Montréal, Que.
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Danielle Bouffard
Divisions of Pathology (Roy, Bouffard) and Dermatology (Watson), Université de Montréal, Montréal, Que.
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A 52-year-old woman presented with a 4-day history of painful, tense, blood-filled blisters on her ankles and dorsal feet, with no mucosal involvement (Figure 1). She had a history of plurimetastatic carcinoma of likely pancreatobiliary origin, for which she had received 2 cycles of immune-activating monoclonal antibodies (durvalumab and tremelimumab) 2 months earlier. For the past 5 months, she had also been receiving a therapeutic regimen of tinzaparin (16 000 units/d subcutaneously) for treatment of pulmonary embolism. Tinzaparin had been temporarily replaced with enoxaparin for an 8-day span, as it was unavailable at the hospital, 2 weeks before the eruption of blisters.

Figure 1:
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Figure 1:

Multiple tense, hemorrhagic blisters, some of which have ruptured, on the ankles and dorsal feet of a 52-year-old woman receiving treatment with low-molecular-weight heparin.

Our differential diagnosis included bullous leukocytoclastic vasculitis or varicella-zoster virus infection. Her complete blood count showed a white blood cell count of 10.2 ×109/L, a hemoglobin level of 94 g/L and a platelet count of 154 ×109/L. Prothrombin time, partial thromboplastin time and international normalized ratio were normal (12 s, 28 s and 1.09, respectively). Histopathologic examination of one of the blisters showed a broad hemorrhagic subepidermal bulla, with no inflammation (excluding leukocytoclastic vasculitis) or viral cytopathic effect (excluding varicella-zoster virus). Although immunotherapy agents may precipitate blistering disorders, the timeline and absence of inflammation on biopsy made this explanation unlikely.

Clinical and histopathologic findings were consistent with bullous hemorrhagic dermatosis, an adverse drug effect probably induced by subcutaneous low-molecular-weight heparin. It is unclear whether re-initiation of tinzaparin or the previous temporary course of enoxaparin was responsible in the case of our patient. Bullous hemorrhagic dermatosis tends to arise after a mean of 7 (range 3–270) days of starting the drug.1 It may also occur with use of dalteparin, warfarin, fondaparinux and unfractionated heparin.1 Changing anticoagulant therapy does not hasten lesion resolution as the condition is self-resolving, hence the importance of maintaining the current anticoagulation treatment if still indicated.1 Our patient’s lesions resolved within 3 weeks, with the same anticoagulation regimen. Unfortunately, she died 4 months after presentation from metastatic disease.

Footnotes

  • Competing interests: None declared.

  • This article has been peer reviewed.

  • The authors have obtained patient consent.

Reference

  1. ↵
    1. Russo A,
    2. Curtis S,
    3. Balbuena-Merle R,
    4. et al
    . Bullous hemorrhagic dermatosis is an under-recognized side effect of full dose low-molecular weight heparin: a case report and review of the literature. Exp Hematol Oncol 2018;7:15.
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Canadian Medical Association Journal: 192 (1)
CMAJ
Vol. 192, Issue 1
6 Jan 2020
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Bullous hemorrhagic dermatosis
Simon F. Roy, Philippe Watson, Danielle Bouffard
CMAJ Jan 2020, 192 (1) E12; DOI: 10.1503/cmaj.191052

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Bullous hemorrhagic dermatosis
Simon F. Roy, Philippe Watson, Danielle Bouffard
CMAJ Jan 2020, 192 (1) E12; DOI: 10.1503/cmaj.191052
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