A bacterial infection of the skin and soft tissues that causes redness, swelling, warmth, and pain. The infection spreads through the deeper layers of skin and can become serious if left untreated.
From Latin 'cellula' (small cell) combined with the Greek suffix '-itis' (inflammation). The term was coined in the 19th century as understanding of cellular structure developed, distinguishing this deep tissue infection from surface skin conditions.
Cellulitis can spread rapidly through tissue planes like ink soaking through paper - what starts as a small red area can engulf an entire limb within hours. Drawing a pen line around the redness helps doctors track whether antibiotics are working or if the infection is advancing.
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