The term 'BAD SPOT' can be broken down into two crossword solutions: ZIT (3 letters) and STAIN (5 letters). A ZIT is a small, inflamed bump on the skin that is caused by clogged pores. It is usually filled with pus and can be painful. A STAIN is a discoloration or smudge on a surface that is caused by dirt, grease, or other substances. Stains can be difficult to remove and can be caused by spills, splatters, and other accidents.