The stress exerted on skin during suturing plays a critical role in the healing process of postoperative incisions. Understanding the underlying mechanisms and patterns of skin stress in different suturing methods is therefore essential for optimizing surgical outcomes. In this study, four common surgical incision geometries were designed for investigation, including the traditional straight incision, as well as Z-shaped, S-shaped, and sawtooth-shaped incisions. All incisions were standardized by their horizontal length and incision width to ensure comparability. To address the issue of excessive specimen deformation compromising experimental data accuracy, failure load tests were performed on each suturing structure. These tests established appropriate load limits to be used in subsequent tension-reducing performance assessments. Material constitutive models derived from tensile tests on skin specimens provided the theoretical basis for analyzing the distributions of stress and strain along different incision patterns. Additionally, digital image correlation techniques were employed to capture detailed strain distributions occurring within the suture zones during the suturing process. By combining experimental data with numerical simulations, the study further elucidated tension distribution in skin at the suture line. The results demonstrate that incision geometry is fundamental to reducing skin tension during suturing. Compared with traditional straight incisions, Z-shaped, S-shaped, and sawtooth-shaped incisions exhibit longer effective incision lengths and intrinsic curvature, both of which contribute to lowering suturing tension. The tension-reducing effects are most pronounced under low to moderate external loads. Although these effects gradually diminish as external loads increase, they remain significantly superior to those observed with straight incisions. Notably, the sawtooth-shaped incision displayed the lowest principal strain at the suture line under equivalent loading conditions, indicating the most effective tension reduction among the four incision types. These findings provide valuable biomechanical insights that could inform the design of suturing techniques to enhance postoperative skin wound healing rates and improve clinical outcomes.