A raised scar mostly after an injury heals as a keloid. When skin is injured, fibrous tissue also called as scar tissue is formed over the wound. In some people, scar tissues (what’s inside a keloid) grow in size developing into reddish smooth, hard growth as keloid.
Are keloids dangerous 
Keloids are mostly not harmful to your health, but they have cosmetic problems.
Symptoms:
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The reddish raised area on the skin sometimes associated with itching
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Keloid scars often become larger than the original wound itself. The patient feels self-conscious if the keloid is big or located in a cosmetically visible body part, such as an earlobe or on the chest in females.
Causes: why do people get keloid?
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Repeated trauma to bony areas like elbows is the most common cause.
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Acne or pimple Scar
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Burns
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Chickenpox scar
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Ear piercing
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Surgical incision site
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BCG Vaccination site
 
Do keloids go away?
Keloids may continue to grow for weeks to months, and they do not disappear on their own. Once a keloid forms, it is permanent until it is treated successfully.
 
Treatment:How do you remove a keloid?
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Corticosteroids injection or combination injections are highly effective provided at our clinic.
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Silicone gel application after trauma.
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Cryosurgery.
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Laser treatment.
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Radiation to decrease size.