Skin-nontumor / Clinical Dermatology

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Skin-nontumor / Clinical Dermatology

Blistering disorders

Blood blister

Reviewer: Mowafak Hamodat, MB.CH.B, MSc., FRCPC, Eastern Health, St. Johns, Canada (see Reviewers page)
Revised: 12 July 2011, last major update July 2011
Copyright: (c) 2002-2011, PathologyOutlines.com, Inc.

Description
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● Blister that forms due to damage to subepidermal vessels and tissue without disruption of epidermis

Terminology
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● Blood blister-like aneurysm: has thin wall, like a blood blister; usually arises in posterior wall of internal carotid artery

Etiology
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● Due to damage to subepidermal tissue and blood vessels, without piercing the skin; fluid is lymph and blood (Wikipedia)
● Usually due to physical injury
● Sudden appearance of lesions on oral mucosa may be diagnostic of angina bullosa hemorrhagica (Minerva Stomatol 2010;59:139, eMedicine)

Treatment
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● None or symptomatic (elevate, ice, soak)

Clinical images
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Finger lesion

Micro description
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● Subcorneal vesicular lesion with erythrocytes trapped beneath thick stratum corneum of toes or fingers

Differential diagnosis
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● Coagulation disorder

End of Skin-nontumor / Clinical Dermatology > Blistering disorders > Blood blister

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