What ?ratul.azed;3000652 said:The worst of cosmetic nightmares is scarring, and stretch marks are scars much too easy to come by. They are tears in the dermis, the flexible middle stratum that maintains the shape of the skin. The tearing is caused by the pulling that occurs with accelerated growth. The rapid transformations of puberty or pregnancy are common aggravators. So are weight gain, muscle-building, and the uses of certain steroids.