Injury marks, also known as scars, are marks left on the skin after an injury or wound has healed. They are usually permanent and can vary in size, shape, and color. Scars can be caused by cuts, burns, surgery, or other forms of trauma. They can also be caused by certain medical conditions such as acne or chickenpox. Scars can be a source of emotional distress for some people, but they can also be a reminder of a past experience or event.