Healing of wounds

wikipedia

Wounds and inflammations heal because of the natural endowment of living tissue with the ability to regenerate and repair itself.The lungs may suffer repeated attacks of an inflammatory condition, such as bronchitis or pneumonia and recover its normal structure and function again, and this true of all organ and tissues. A cut wound heals by the accumulation of blood cells in the wound from the bleeding, by the escape of serum into the wound from the edematous, swollen and inflamed tissue,

After a day or two the cut capillaries begin to bud, forming new blood vessels, cells grow around these new vessels, forming little red granulations, and that is how the wound fills up and grows together again. The same process takes lace in a clean cut or in an ulcerated wound.

It is only a matter of degree and extent. when a clean cut wound heals quickly without much reaction or infectection, it is called "healing by first intention". but whwn an injury is followed by infection or ulceration it heals by "second intention" so to speak