Before stretch marks become visible, subtle changes occur in the skin’s microstructure. The collagen and elastin fibres weaken, losing their cohesion and elasticity. During this period, the skin may react with a feeling of tightness, itching or a slight stinging sensation. This is a sign that the tissues are under strain and are beginning to lose their ability to adapt. At this stage, the process is still partially reversible, as the skin’s structure has not been permanently damaged. This is precisely why early skincare intervention and improved hydration can significantly reduce the risk of permanent changes. Once the fibres break, the process becomes irreversible and progresses to the stage of permanent stretch marks.