What are the aims of this leaflet?
This leaflet has been written to help you understand more about keloids. It tells you what they are, what causes them, what can be done about them, and where you can find out more about them.
What are keloids?
When a wound heals, it leaves a scar. A keloid is a special type of scar; one that grows too much and can even become larger than the original wound. It is not uncommon for surgical or injury scars to become a little lumpy (hypertrophic). A keloid differs from these in several ways:
A keloid can come up after very minor skin damage, such as an acne spot, or even if there has been no obvious damage to the skin at all.
It can spread outside the original area of skin damage.
It may last permanently.
What causes keloids to occur?
This is not fully understood. Most people never get keloids: others get them after the most minor of injuries. Several things affect the risk of getting one:
Dark skinned people get keloids much more easily than those with a paler skin. They are especially common in people with black skin.
Keloids can crop up anywhere but do so most easily on certain areas, such as the skin around the upper chest and shoulders - particularly over the breastbone (sternum) - and on the earlobes.
Wounds that are under tension while healing, or which get infected, are particularly likely to form keloids, as are burn and acne scars.
Having previously had a keloid increases the risk of getting another if subjected to trauma to their skin.
Keloids most commonly arise between the ages of 10 and 30 years.
Keloids are not contagious and have a very small risk of turning into skin cancers, which is more likely if they are treated with radiotherapy.
Are keloids hereditary?
No. However, 5-10% of Europeans with keloids have a positive family history.
What are the symptoms of a keloid?
Usually there are none; but some are tender, painful, itchy, or cause a burning sensation. The main problem is that their appearance may cause embarrassment. If they are very tight, they can limit movement at nearby joints.
What does keloids look like?
Keloids look like exaggerated scars. They are raised above the skin around them and sometimes they are domed. They can extend beyond the limits of the skin damage that caused the scar to come up in the first place. They are shiny and hairless; usually they feel hard and rubbery; and new ones are often red or purple, becoming darker or sometimes paler as they age. Most people with keloids have only one or two. However some people have many, especially if they have come up after acne or chickenpox scars.
How will be diagnosed?
Your doctor will in most cases be able to make the diagnosis of a keloid just by looking at your skin. No investigations are usually needed.
Can a keloid be cured?
It is unusual for a keloid to be cured after treatment. The main problem is that cutting a keloid out often leads to an even bigger one forming later in the same place.
How can a keloid be treated?
Treatment is difficult and not always successful. Possible lines of treatments include the following:
Injections of a steroid (triamcinolone) into a keloid may help to flatten small early ones.
Steroid-impregnated tape applied for 12 to 24 hours a day may help to flatten keloids.
Freezing with liquid nitrogen may also stop early keloids from growing.
Putting a silicone sheet over them at night for several months helps some keloids to flatten. Silicone in gel form is also available. Long-term compression with pressure bandages sometimes helps too.
Laser treatment makes keloids less red, but does not make them smaller.
If a keloid is cut out, it usually comes back, and may end up larger than before. This risk falls if the area is treated after the operation with pressure dressings or local steroid injections.
Sometimes, 5-fluorouracil and imiquimod are used to reduce size either alone or before using other types of treatment.
What can I do?
With keloids, prevention is better than cure. You have an extra risk of getting a keloid if:
You have had a keloid before.
Members of your family have had them.
You have a dark skin.
If you are at risk, you should avoid trauma such as tattoos or body piercing, particularly if these would go through one of the high-risk areas of skin, such as the ear lobes. If you have acne, see your doctor to make sure it is treated vigorously to limit the risk of scarring. You should avoid having skin surgery for cosmetic purposes.
Where can I get more information?
Web links to detailed leaflets:
For details of source materials used please contact the Clinical Standards Unit (email@example.com).
This leaflet aims to provide accurate information about the subject and is a consensus of the views held by representatives of the British Association of Dermatologists: its contents, however, may occasionally differ from the advice given to you by your doctor.
This leaflet has been assessed for readability by the British Association of Dermatologists’ Patient Information Lay Review Panel
BRITISH ASSOCIATION OF DERMATOLOGISTS
PATIENT INFORMATION LEAFLET
PRODUCED MARCH 2008
UPDATED AUGUST 2011, JULY 2014
REVIEW DATE JULY 2017