As a blood clot on a surface injury dries out it forms a protective scab over the wound allowing new skin to grow underneath. Colour-enhanced scanning electron micrograph of a blood clot, with ...

and dead bacteria that is actually a roadblock to new migrating skin cells which must now take a detour around that annoying ...

Black canker creates irregular brown or black wounds on stems between April and June. The wounds, called cankers, develop saucer-shaped fungal bodies filled with spores. Willow scab attacks new twigs ...