Gua sha is fundamentally a pressure-and-glide technique. Without adequate lubrication, the tool drags across the skin, increasing friction and the risk of redness, micro-tears, or post-treatment sensitivity. From a biomechanical perspective, oil reduces shear stress between the tool and the skin surface, allowing smoother, more controlled strokes. According to dermatological research published by the American Academy of Dermatology ( https://www.aad.org ), excessive friction during manual skin treatments can disrupt the skin barrier. Therefore, using a suitable oil is not optional—it is a protective requirement for safe gua sha use. Oil vs. Serum vs. Cream: What Works Best with Gua Sha Although many people experiment with serums or moisturizers, oils remain the gold standard for gua sha. Serums are often water-based and absorb too quickly, leading to uneven glide. Creams may contain occlusives that pill under pressure. Oils, by contrast, provide sustained slip without immediate absorp...