There are several treatments available, but none have been shown to be more effective than others.
Treatment can be difficult and is not always successful.
Treatments that may help flatten a keloid scar include:
steroid injections
applying steroid-impregnated tape for 12 hours a day
applying silicone gel sheeting for several months
Other options include:
freezing early keloid scars with liquid nitrogen to stop them growing
laser treatment to reduce redness (but this will not make the scar any smaller)
surgery, sometimes followed by radiotherapy, to remove the scar (although it can grow back and may be larger than before)
If you're bothered by a keloid scar and want help, see a GP.