Post healing of injury, if extra scar tissue is formed then they are known as keloids. Chicken pox, cuts from surgery, ear piercing, acne and burns are causes for keloids. Tender and itchy scars, lumpy scars and scars located at the site of injury are symptoms of this disorder. Cryotherapy, laser treatments, removal by surgery and radiation are treatments for keloids. They only cause aesthetic problems and do not affect health.