A keloid is an extra growth of scar tissue over a skin wound. It grows beyond the margins of the skin wound. A keloid can be thick and vary in size from 1 to several inches. They are not harmful to general health.
Keloids can occur anywhere but they are more common on:
Scar tissue is a part of the normal healing process. With keloids, the scar tissue grows in an uncontrolled manner. The scar continues to grow even after the wound has been covered. The growth can continue for weeks or months.
Keloids are more common in people with African American, Asian, or Hispanic ethnicity. They are also more likely to occur between 10-30 years old.
Factors that may increase your chance of keloids include:
Keloids often begin as small lumps at the site of a skin injury. They gradually grow beyond the edges of the wound.
For most, the scar is the only symptom. Some may have other symptoms such as:
You will be asked about your symptoms and medical history. A physical exam will be done. Diagnosis is often based on exam and history but you may also be referred to a skin specialist to confirm diagnosis.
Some keloids may go away on their own, but this is rare. If the keloid is not bothersome, then it does not need to be treated.
A large or irritating keloid may be removed with surgery, lasers, or injections.
To prevent the regrowth of keloid after surgery, the doctor may advise 1 or more of the following:
American Academy of Dermatology
American Society of Plastic Surgeons
Canadian Dermatology Association
Keloid and hypertrophic scar. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T114293/Keloid-and-hypertrophic-scar. Updated April 6, 2016. Accessed May 9, 2016.
Scar revision. American Society of Plastic Surgeons website. Available at: http://www.plasticsurgery.org/Reconstructive-Procedures/Scar-Revision.html. Accessed May 9, 2016.
Malaker K, Vijayraghavan K, et al. Retrospective analysis of treatment of unresectable keloids with primary radiation over 25 years. Clin Oncol. 2004;16:290.
Manca G, Pandolfi P, et al. Treatment of keloids and hypertrophic scars with bleomycin and electroporation. Plast Reconstr Surg. 2013;132(4):621e-630e.
O'Brien L, Jones DJ. Silicone gel sheeting for preventing and treating hypertrophic and keloid scars. Cochrane Database Syst Rev. 2013;9:CD003826.
Conejo-Mir JS, Corbi R, et al. Carbon dioxide laser ablation associated with interferon alfa-2b injections reduces the recurrence of keloids. J Am Acad Dermatol.1998; 39:1039.
5/22/2014 DynaMed Plus Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T114293/Keloid-and-hypertrophic-scar: Shaffer JJ, Taylor SC, et al. Keloidal scars: A review with a critical look at therapeutic options. J Am Acad Dermatol. 2002;46:S63-S97.
Last reviewed June 2016 by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.