Editing Scar (section)

===Keloid===
{{Main|Keloid}}
Keloid scars are a more serious form of excessive scarring, because they can grow indefinitely into large, tumorous (although benign) [[neoplasm]]s.<ref name=Roseborough2004/>

Hypertrophic scars are often distinguished from keloid scars by their lack of growth outside the original wound area, but this commonly taught distinction can lead to confusion.<ref name="Roseborough2004a">{{cite journal |vauthors=Roseborough IE, Grevious MA, Lee RC | title = Prevention and treatment of excessive dermal scarring | journal = J Natl Med Assoc | volume = 96 | issue = 1 | pages = 108–16 | date = January 2004 | pmid = 14746360 | pmc = 2594768 }}</ref>

Keloid scars can occur on anyone, but they are most common in dark-skinned people.<ref>Martini, Frederic H. (2006). ''Fundamentals of Anatomy & Physiology,'' Seventh Edition, p. 171. Benjamin Cummings, San Francisco.</ref> They can be caused by surgery, cuts, accident, [[Acne vulgaris|acne]] or, sometimes, [[body piercings]]. In some people, keloid scars form spontaneously. Although they can be a cosmetic problem, keloid scars are only inert masses of collagen and therefore completely harmless and not cancerous. However, they can be itchy or painful in some individuals. They tend to be most common on the [[shoulder]]s and [[chest]]. Hypertrophic scars and keloids tend to be more common in wounds closed by secondary intention.<ref name=secinten201104/> Surgical removal of keloid is risky and may exacerbate the condition and worsening of the keloid.