I am a 29-year-old working professional. I happened to lose a lot of weight in the past few months and noticed stretch marks on my arms and legs ever since. These marks are becoming prominent by the day. How do I manage such marks? Straie or stretch marks are caused as the layer beneath the skin called the dermis begins to stretch or tear leaving the blood vessels to show in purple or a pinkish shade. This occurs with sudden weight gain or weight loss often seen in athletes bodybuilders and weight lifters. This could also be due to genetics.