We have all sustained an abrasion or a cut at some point. The first signal is usually pain, and perhaps blood.

If it’s a small wound, we clean the affected area, put on a plaster and wait for the body to orchestrate a complex cascade of events designed to heal itself.

If you’re young and healthy, life goes on as the healing process takes place.

But there’s a segment of people whose wounds do not heal within a reasonable time frame.