Acne is a skin condition that appears as pimples or zits on the face, back, and shoulders. Acne occur at any age but is most common around puberty. Skin with mild acne often heals completely. But more severe acne can result in significant scarring and can be permanent.
How acne scars form
Many people mistakenly believe a red mark on the skin after a pimple heals is a scar. In general, redness is part of the healing process which can last for up to a year. A mark that is still visible more than a year after a pimple is gone is probably a scar.
Acne scars typically form when a deep pimple or acne blemish breaks under the surface of the skin. This can cause permanent damage to skin tissue. As the body works to repair the damage, a protein fiber called collagen forms new skin to close up this injury. If there is too much collagen in the repaired area, a raised scar can form. This kind of scar is known as keloid or hypertrophic scarring. If there is less tissue after healing than before, scar tissue can look sunken or holey. This kind of scar is known as depressed or atrophic scarring.
Types of acne scars
Just as acne can be mild or severe, depressed or atrophic acne scarring can be deep or shallow. Doctors refer to three basic types of depressed acne scarring depending on the shape and appearance of the scars.
• Icepick – these scars look like skinny, deep holes; as though someone stuck an ice pick into the skin. The sides of these scars are angled and meet in the middle at the bottom of the hole. Because these scars are typically quite deep, treatments that buff or refinish the top layers of skin are rarely effective for icepick scars.
• Boxcar – these scars can be round or oval but have sides that push straight down into the skin like the vertical sides of a train car. Shallow boxcar scars may respond to resurfacing treatments. Deeper boxcar scars need more aggressive treatment.
• Rolling – these scars resemble rolling hills that rise and fall on the surface of the skin.