Keloidal refers to the formation of a keloid, a raised and thick scar that grows beyond the boundaries of the original injury. Synonyms for keloidal include hypertrophic, elevated, nodular, and thickened. Hypertrophic scarring occurs when the body produces too much collagen in response to an injury, leading to a raised, red, and thick scar. The term elevated identifies a scar that rises above the surrounding skin. Nodular is used to describe a keloid that projects outward and is rounded in shape. Thickened scars are formed from excessive collagen that results in a raised, firm, and dense scar. These terms can be interchanged when referring to the same type of scar.