Scars are the product of tissue repair after an injury to the skin.
Scarring is a complex phenomenon which begins in the seconds after the injury, and takes place in several steps, generally lasting from a year to 18 months:
– The clotting or coagulation phase, where bleeding is followed by the formation of a blood clot where repair tissue develops : the scab.
– The inflammatory phase, where the extracellular matrix is produced and foreign bodies are destroyed in the escariforme tissue by leucocytes and an inflammatory reaction.
– The proliferative phase characterised by dermal and epidermal reconstruction which is sufficient to compensate for the loss of tissue. This new tissue is initially very imperfect.
– The remodelling phase where the scar’s structure blends with the skin, and its resistance to tension increases.