A collection of blood that pools outside blood vessels, usually caused by injury, forming a bruise or bump under the skin.
From Greek 'haima' (blood) + 'oma' (swelling or tumor), literally meaning 'blood swelling.' First used in medical texts in the 1600s.
A haematoma is your body's way of leaving evidence—when you get a black eye or bad bruise, you're seeing hemoglobin from burst blood vessels slowly breaking down and changing colors as your immune system cleans up the mess.
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