The term UNWELCOME MARK can be summarized as a physical mark that is not desired or wanted. The crossword solution for this term is SCAR, which is a mark left on the skin after a wound or injury has healed. Scars are usually permanent and can be caused by cuts, burns, surgery, or other forms of trauma. They can also be caused by certain skin conditions such as acne. Scars can be both physically and emotionally uncomfortable, making them an unwelcome mark.