Hypertrophic or Keloid Scars
Appearance: A hypertrophic scar looks like a raised, firm mass of tissue. These types of scars often grow larger than the original wound. Hypertrophic scars caused by acne are most often found on the torso, especially in men.
Development: Unlike ice pick or boxcar scars, hypertrophic scars are not caused by a loss of tissue. Rather, they develop because of an overproduction of collagen.
Common treatments: Steroid (cortisone) creams, tapes, or injections are used to help shrink and flatten the scar. Interferon injections are also used to soften scar tissue.