These mites are largely parasitic and consume blood, skin and keratin. Dust mites, which feed mostly on dead skin and hair shed from humans instead of consuming them from the organism directly, evolved from these parasitic ancestors.
Hypertrophic scar (4 months after incident) A hypertrophic scar is a cutaneous condition characterized by deposits of excessive amounts of collagen which gives rise to a raised scar, but not to the degree observed with keloids. Like keloids, they form most often at the sites of pimples, body piercings, cuts and burns. They often contain nerves and blood vessels.
Hypertrophic scarring and keloids. Light micrograph of hypertrophic scar (200X) with collagen that is oriented parallel to skin surface and has numerous myofibroblasts. Light micrograph courtesy of T. Brent Ponder, MD, St Louis University Anatomic Pathology.