Most scars on the face are usually caused by self infliction when attempting to squeeze an acne, resulting in skin injury. When the skin begins to heal the inflamed acne, the natural process of skin repair may be impeded by the bacteria, resulting in lesser skin resurfacing. Thus, two types of scars are formed. Depressed and raised scars.
Depressed scars are most common in which is caused by loss of tissue (injury) at the site of acne. However, raised scars known as keloids are caused by skin injury such as vaccination or forcefully press acne. Keloids are more common in men and darker skin and the reason for it is still unknown.