Moderate to severe acne may cause depressed acne scars, which are also called acne holes. These holes occur when the skin loses underlying support, creating a hole-like appearance. Fortunately, the holes caused by acne are treatable, according to the American Academy of Dermatology.

The results of an uneven shave can last long after the stinging stops. Razor bumps and ingrown hairs develop when uneven pressure is applied to the blade or bacteria is transferred to the pores. The skin typically remains red as it heals and can turn into a dark tone over time.

Burns cause damage to the surface of your skin. A first degree burn typically produces redness and heals on its own. A second degree burn produces blisters and can cause scarring. A third degree burn destroys layers of skin and can cause extensive scarring and keloid formation.

Scarring has many causes, including cuts, scrapes, burns, acne and even small infected wounds. Scars occur when the outer layer of skin -- the epidermis -- becomes damaged. As the skin heals itself, a new layer of skin grows to cover the wound and protect the body.

Scars are made of fibrous, connective tissue. They are created naturally by the body to heal damaged skin or organs, according to RightHealth.com. Since the body cannot re-create new skin or tissue, it develops a scar that serves as a protective barrier.

You may have experienced folliculitis if you've ever noticed tender bumps on the skin, particularly after shaving or waxing. Folliculitis is an infection of the hair follicle or root that can occur anywhere on your body.

Scars can arise from acne, burns, cuts or from other causes of trauma to the skin. Over-the-counter scar creams may take longer to work than a prescription strength medication, if they work at all. Your dermatologist or primary care physician can prescribe effective creams to treat your scars.

If you need surgery, the potential for scarring may be the last thing on your mind. However, scarring is a natural part of the wound healing process, and surgery is bound to leave some marks.

Cystic acne is one of the most severe forms of acne you can develop. It can run deep into your skin and become inflamed and painful. Cystic acne is also very likely to leave scarring on your skin after it disappears. Large swaths of cystic acne can result in deep and embarrassing scar marks.

Scars are the result of your body healing itself from an injury- or surgery-based wound, according to MayoClinic.com. Permanent scars are commonly seen after burns, cuts and sores. They are formed when skin cells and tissues, called fibroblasts, multiply to repair the damaged cells.

In her book, "Beauty by Nature," Brigitte Mars writes that the skin has the ability to regenerate and heal. There are three stages of skin healing, with the first being when a scab forms along with any redness or swelling.

Scar tissue occurs when collagen fibers form over an injury during the healing process. Sometimes these fibers grow in all directions, causing scars to appear darker and more pronounced, according to Massage Williamsburg in Brooklyn, New York.