Both are raised and thickened scar tissue that form after a wound heals. Hypertrophic scars are confined to the original damaged skin and usually develop within weeks of injury whereas keloids can grow well beyond the original area of skin damage and can develop up to 1 year after the initial injury. The exact cause for keloids is unknown but they are more common on the chest, back, shoulders and earlobes. Sometimes something as little as a pimple can result in keloid formation.
When our skin is damaged, new collagen is formed to heal it resulting in a scar. Usually over time the scar becomes flat and less red, but the final appearance of a scar can depend on many factors. We can try to diminish the appearance of scars in the initial phase through proper wound care, scar massage and silicone gels or pads.
For hypertrophic and keloid scars, corticosteroid injections into the scar tissue are a treatment option which can help to soften the scar tissue. This alleviates symptoms of pain and itching and with repeated injections can often help flatten the scar. Surgical scar revision is also an option when non-surgical methods are ineffective.
Consult a doctor for a better understanding of the treatment options for any scars that you may have.
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