Plasma and fibrinogen.
you cant have a scab without a clot, the clot forms when the blood coagulates (becomes thick and basically fills the hole, over time the scab forms and uses the clot like scaffolding to fill the gap with new cells, when its done falls off.
You bleed until a scab forms.
A scab forms as the wound starts to heal.
The scab forms a seal over the cut, helps to keep germs at bay, and so lessen the chances of the cut becoming infected.
When getting a tatoo, the skin is opened by the needle , a scab forms as it would if you cut yourself.
A scab
Plates and Fibers work together to form the scab
As an injury such as yours heals, multicolored dead skin usually forms.
Protein
A protein that forms an ion channel through a membrane is most likely to be a transmembrane protein.
A scab grows over the wound and then heals.