Pfuhls sign, also known as the "groove sign" or "groove line", is a medical term used to describe a diagnostic symptom in certain conditions. This sign refers to a visible groove or linear dent that appears on the skin's surface. It typically occurs due to pressure or indentation caused by underlying structures, such as bones or tendons. Although it is often called Pfuhls sign, it is essential to note that different medical fields may use various synonyms for this phenomenon. These include groove mark, furrow line, deformation impression, or indentation. Regardless of the term used, medical professionals rely on the observation of this sign to aid in diagnosis and treatment planning.