In normal healing, a wound goes through three phases. In phase two, these platelets release proteins called growth factors that stimulate the production of new tissue. In the final stage, the new tissue is accepted by the body and matures. At any stage, however, a lot of things can go wrong. Healing relies on good blood flow.
Proper nutrition is essential.
The effects of certain medications or diseases that inhibit tissue repair must be controlled or minimized. The wound itself must be clean and free from foreign bodies. It must be free from infection. And the wound must be safe from trauma and aggravation. A problem with just one of these elements will stall the healing process.