Sulcus vocalis, like vocal fold scarring, is an indentation or retracted area on the vocal fold (cord) from scarring. It's sometimes called a hole in the vocal cord. The vocal cords are the structure that open for breathing, close for swallowing, and vibrate as air passes through to produce sound. With sulcus vocalis, an alteration in the vibration of the cord happens, causing abnormal vocal sounds including hoarseness. It can also cause vocal weakness and fatigue.