The term PERMANENT MARK can be broken down into two crossword solutions: SCAR (4 letters) and STAIN (5 letters). A SCAR is a mark left on the skin after a wound or injury has healed. It is usually raised and can be caused by surgery, accidents, burns, or other trauma. A STAIN is a discoloration on a surface that is usually caused by dirt, ink, paint, or other substances. Stains can be permanent if they are not removed with a cleaning agent.