Stretch marks are fine scars that occur in the dermis layer of the skin when it is stretched too quickly and your normal collagen production is disrupted. The most common causes of stretch marks are pregnancy or rapid weight gain, bodybuilding, and growth spirts. While they are more common in women, many men get stretch marks as well. MicroNeedling and Ultherapy work to rebuild collagen, faster and more effectively than expensive creams and lotions. The result is smoother, less noticeable stretch marks.