The term 'leave a mark' can be interpreted in two ways. The first interpretation is that it is a phrase meaning to make an impression or have a lasting effect on someone or something. The second interpretation is that it is a reference to two words, SCAR and SCAB, which are both four letters long. A SCAR is a mark left on the skin after a wound has healed, while a SCAB is a crusty protective layer that forms over a wound.