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The sudden appearance of a dark, blood-filled blister on your child’s skin can be a jarring experience for any parent. One moment, their skin is clear; the next, an angry, purple-black bubble has emerged, looking like a tiny, trapped storm under the surface of the epidermis. Your immediate instinct might be a mixture of panic and confusion. You tell yourself it is “just a blister,” a minor inconvenience of childhood, yet the visceral appearance of it—swollen, dark, and seemingly full of pressure—suggests something more sinister. As a parent, you find yourself caught between the desire to fix it and the fear of making it worse.
To understand how to treat these spots, one must first understand the anatomy of the injury. A blood blister is a specific type of subepidermal hematoma. Unlike a standard friction blister, which is filled with clear serous fluid, a blood blister occurs when a more forceful trauma ruptures the fragile capillary vessels deep within the dermal layer without breaking the protective surface of the skin. This results in a pocket of blood being trapped in a raised, pressurized bubble. It is essentially a bruise that reached the surface but lacked an exit point.
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