題目

較容易發生在胸口、肩膀、上背部 Mechanical stretching forces — The external mechanical forces that are placed on the wound/scar during daily life are a primary factor involved in abnormal scar formation. Multiple lines of evidence suggest that stretching forces can both cause and worsen pathologic scars, particularly when genetic and systemic factors are also in play. Supporting the importance of local mechanical forces in keloid development is the observation that **keloids have a strong predilection for body locations that are prone to frequent skin stretching and contraction (eg, the anterior chest and scapula).** By contrast, they rarely occur where skin tension is uncommon (eg, the parietal region of the scalp, anterior lower leg, and upper eyelid) \[16\]. These regional differences can be seen even in patients with multiple/large keloids. 根據有限的流行病學數據，具有非洲或亞洲血統的個體發生瘢痕疙瘩的風險似乎最高