i have just checked the dictionary and this is what it says "crust that forms over a wound" or "offensive some who works when there colleagues are on strike" www.facesreunited.webs.com you will find more info about this
A scab
Scab has two meanings.The dark crust over a wound while it is healing.A worker that refuses to join a union when one is available where they work.
If around a wound it is a scab forming.
A scab grows over the wound and then heals.
No but if you pick it the scab will be a scar
The polish word for scab is strup
Someone had a scab which turned into a scar
Scar tissue is formed under the scab.
They can scab over and once the scab falls off, the ink may fade where the scab has been.
is a keyloid and they are hard to get rid of. do some research on them!
You were probably fingering it in your sleep, and cut the poor little thing.
It could mean that the flesh has died, skin usually turns black when there is a death in the tissue and may be a breeding ground for some bacteria and infection. But if it doesn't hurt, then it could just be a discolouration, either way you should get it checked by a health professional who can examine it physically.