Acne is a common condition that causes blocked pores, pimples, cysts, and other lesions on the skin. While it is most common in teenagers, acne can affect people of all ages, most often appearing on the face, neck, chest, back, shoulders and upper arms. In many cases, acne can lead to acne scars, especially if it is severe.
For many patients, once acne lesions clear up or are removed, they leave behind discolorations and indentations on the skin. Scars may form after acne has healed and cleared, and may vary from person to person. Some people may have small flat scars that are not very noticeable and others may suffer from more visible indented scars on the face or affected area. Acne scarring is most often caused by larger acne lesions, such as cysts or nodules, which can swell and rupture, causing a break in the wall of the individual pore. Infected material from the inflamed lesion can spill out through this break and can affect the nearby healthy tissue, leading to the appearance of a scar.