Linear focal elastosis: Keloidal repair of striae distensae.

Linear focal elastosis and striae distensae coexisted in a 32-year-old black man in their typical distribution on the lower back. Many striae appeared when he lost 50 lb in 1991. Only some of them became hypertrophic and others remained atrophic; striae distensae of the shoulders and buttocks remained atrophic, whereas most in the lumbosacral region became indurated and cordlike. Histologically, the former lacked elastic fibers and the latter showed a marked increase in thick elastic fibers. Linear focal elastosis in some patients may represent hyperplasia of elastic fibers in response to their damage. This "elastic fiber keloid" seems to be equivalent to collagen keloid, i.e., ordinary keloid, in the lumbosacral region.