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2. Scar tissue that grows larger over time

Unlike the average scar, keloids grow bigger over time. Experts are not certain about the cause of keloids, but there is speculation that it is due to altered cell signals connected to proliferation and inflammation. Also, unlike the average scar, keloids are unpredictable. Sometimes they do not appear until well after injury, and sometimes they start from minor inflammation, like an acne pimple, a burn, or a piercing.

scar tissue expanding keloid
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