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.
Most fresh scars appear reddish in color as this is a sign of wound healing and new collagen production. Sometimes this healing can be excessive and a hypertrophic or keloid scar can develop. Without seeing a picture of your scar it would be difficult to comment on it. This type of excessive healing or scar formation doesn't begin before 6 weeks from your injury. Most likely you are healing normally.