I have noticed that scabs formed over wounds itch a lot. And if the scab comes off then the skin rarely completely heals and a scar is left. Assuming scabs are important for the healing of skin ,shouldn't the scabs not itch?
Since they itch,we sometimes scratch them off which is detrimental to skin health and also can lead to infections.
If they wouldn't have itched, most people wouldn't scratch them off thus ensuring better health for the organism.