Mark on healing skin (4)

I believe the answer is:

scab

(Other definitions for scab that I've seen before include "he refuses to come out" , "Crust of congealed blood" , "Sore - blackleg" , "Dried crust on wound" , "Someone who works during a strike" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.