Keloid it may ulcerate. Removing the scar is one treatment option; however, it may result in more severe consequences: the probability that the resulting surgery scar will also become a keloid is high, usually greater than 50%. Laser treatment has also been used with varying degrees of success. Keloids form within scar tissue. Collagen, used in wound repair, tends to overgrow in this area, sometimes producing a lump many times larger than that of the original scar. They can also range in color from pink to red. Although they usually occur at the site of an injury, keloids can also arise
Scar or muscle, are lost. This type of scarring is often associated with acne, chickenpox, other diseases (especially "Staphylococcus" infection), surgery, certain insect and spider bites, or accidents. It can also be caused by a genetic connective tissue disorder, such as Ehlers–Danlos syndrome. Stretch marks (technically called "striae") are also a form of scarring. These are caused when the skin is stretched rapidly (for instance during pregnancy,<ref name="doi10.1002/14651858.CD000066"></ref> significant weight gain, or adolescent growth spurts), or when skin is put under tension during the healing process, (usually near joints). This type of scar usually improves in appearance after a few years.