Stretch and pinch tests to assess the suitable management for acne rolling scars

Demonstration of stretch and pinch tests with corresponding ultrasound examination

The acne rolling scar on the right medial zygoma showing a dimple sign in a pinch test and an uneven sign in a stretch test. The ultrasound examination of the acne rolling scar at rest showed a homogenous band (red box) disrupting and blurring the clear dermoepidermal junction and the junction between the dermis and the subcutaneous fascia. The irregularity of the skin surface was more evident after pinching and the homogenous blurring persisted after stretching, corresponding to a dimple sign and an uneven sign, respectively.
Red line, dermoepidermal junction; Yellow line, junction between the dermis and the subcutaneous fascia

展示拉伸与捏压测试及其相应的超声检查。右侧颧骨内侧的痤疮滚动疤痕在捏压测试中呈现凹陷征象，而在拉伸测试中呈现不均匀征象。静止状态下的痤疮滚动疤痕超声检查显示，一致性的带状结构（红色方框）干扰并模糊了表皮与真皮的清晰交界以及真皮与皮下筋膜的交界。皮肤表面的不规则性在捏压后更为明显，而一致性模糊在拉伸后持续存在，分别对应凹陷征象与不均匀征象。红色线条代表表皮与真皮交界；黄色线条代表真皮与皮下筋膜交界。