What are Stretch Marks: Stretch marks (striae) are indented streaks that often appear on the abdomen, breasts, stomach, back, hips, buttocks and thighs. Over time they become less noticeable. Stretch marks are particularly common in pregnant women. 
What Are The Types of Scars?
These are several different types of scars including:
Keloid scars. These scars are the result of an overly aggressive healing process. They extend beyond the original injury. Over time, a keloid scar may hamper movement. Treatments include surgery to remove the scar, steroid injections, or silicone sheets to flatten the scar. Smaller keloids can be treated using cryotherapy (freezing therapy using liquid nitrogen). You can also prevent keloid formation by using pressure treatment or gel pads with silicone when you are injured. Keloid scars are most common among people with dark skin.
Contracture scars. If your skin has been burned, you may have a contracture scar. These scars tighten skin, which can impair your ability to move. Contracture scars may also go deeper, affecting muscles and nerves.
Hypertrophic scars. These are raised, red scars that are similar to keloids but do not go beyond the boundary of the injury. Treatments include injections of steroids to reduce inflammation or silicone sheets, which flatten the scar.
Acne scars. If you've had severe acne, you probably have the scars to prove it. There are many types of acne scars, ranging from deep pits to scars that are angular or wavelike in appearance. Treatment options depend on the types of acne scars you have.
Different Levels of Burns: erm “burn” means more than the burning sensation associated with this injury. Burns are characterized by severe skin damage in which many of the affected cells die. Depending on the cause and degree of injury, most people can recover from burns without serious health consequences. 
There are three primary types of burns: first-, second-, and third-degree.