Stretch Marks, How to Treat Them? Redondo, Palos Verdes Stretch marks on the skin, or striae distensae, can result from pregnancy, obesity, or hormonal changes, causing psychological distress in women. So far, there have been no objective scales to define the Stretch marks = proof of growth, not flaws. They happen when skin stretches faster than collagen can keep up pregnancy, puberty, or body changes. Moisturizing, massaging, and collagen boosting What are Stretch Marks? Get the Low Down on this Common Skin Concern Unveiling the Truth: Causes of Stretch Marks and How to Prevent Them Stretch Marks: Why (and Where) You Get Them