There are different types of scars but the two main types are Keloid and Hypertrophic.
Keloid
A keloid scar is a type of raised scar that occurs when the body produces too much collagen in response to an injury or wound. These scars can be thick, rubbery, and often extend beyond the boundaries of the original injury. Keloid scars can be itchy, tender, and even painful. They can develop anywhere on the body, but are more common on the chest, back, shoulders, and earlobes.
Hypertrophic scars
A hypertrophic scar is a type of raised scar that develops when there is an overproduction of collagen during the healing process of a wound. However, unlike keloid scars, hypertrophic scars tend to stay within the boundaries of the original injury. They can be red, raised, and firm, and can also be itchy or painful. Hypertrophic scars commonly occur on the chest, back, shoulders, and joints, and may take several months to a year or more to fully mature.