Hypertrophic scars are most likely to occur:

Hypertrophic scars are characterized by their raised, thickened appearance and are a result of an overproduction of collagen during the wound healing process. These types of scars commonly occur in areas where the skin is subject to tension or movement.

Scars located over joints have a higher risk of becoming hypertrophic because of the constant motion and stress applied to the skin in these areas. The tension from joint movement can stimulate excessive collagen production, which promotes the formation of a hypertrophic scar. This is particularly relevant for joints that are regularly flexed or extended, creating an environment conducive to this type of abnormal wound healing.

Additionally, certain physical characteristics of these areas, such as skin tension and the complexity of how the skin interacts with underlying structures, make hypertrophic scars more common in joint regions compared to other sites like the face or trunk, where the conditions for collagen production may differ.