These are firm, smooth and dense spontaneous overgrowths of fibrous tissue that form on a healed wound.
Keloid scars radiate from the original spot. They do not spontaneously subside and might arise even after excision.
Forming soon or long after a wound, keloids can get very uncomfortable and itchy and extend beyond the boundaries of the healed wound.
Hypertrophic scars are produced through any cases of abnormality during the healing process, this especially occurs when the deep dermis is affected by burns. The tension in a healing wound causes a hypertrophic scar.
Treatment
Intralesional injections given every 4 weekly helps to reduce the size of hypertrophic scars and keloids
Cryotherapy can be done
Excision followed by intralesional injections is also done for very big keloids