Keloid borders are well demarcated but irregular in outline, and are pink to purple in color. Some keloids are accompanied by hyperpigmentation, and lesions may itch as they form and grow.
Lesions may be lumpy or ridged. Diagnosis is often based on appearance of the skin or scar; however, a skin biopsy may be necessary to rule out other skin growths, such as tumors.
Keloids are composed of thick, esinophilic acellular bands of collagen, with increasing mast and plasma cells and an absence of elastin. Whorls of haphazardly arranged young fibrous tissue and fibroblasts result in marked thickening of the dermis.
Keloids occur most often on the shoulders, upper back and chest where the skin is thickest and scars are under the most tension.
Keloids are not medically dangerous, but some patients might wish to have them removed for cosmetic reasons. Corticosteroid injections, cryotherap, laser treatments, radiation and surgical removal are all options for reducing the size of keloids; however patients should be warned that a larger keloid scars may return after surgical removal.
Keloids are the excess growth of scar tissue that occur at the site of a healed skin injury, and often extend beyond the original injury site. Keloids can grow on injury sites resulting from acne; burns; chickenpox; minor cuts or scratches; traumatic wounds; or at the site of vaccine administration. They occur most often in adults aged 20 to 30 years and are more common among black, Hispanic and Asian people.