Stretch marks are strokes that are often visible on the skin of the body where fat is concentrated, such as the breast, upper abdomen, upper arms, buttocks, and thighs. Stretch marks can occur to anyone, both in women and in men. Fortunately, this skin streak can be removed. Scars that were originally red, pink, or purple will eventually change to white or gray, depending on the color of the skin. Collagen, Determinants of Stretch Marks Not everyone experiences stretch marks. This condition is only experienced by people whose skin contains a little collagen or protein that makes skin supple. Stretch marks generally occur because your body grows faster than the development and elasticity of the skin. When the skin stretches quickly due to a member of the body expanding or gaining weight, the middle layer of the skin (dermis) will thin out so that the layers beneath it come to the surface. This condition is called stretch marks. Conditions that can cause stretch marks include: P...