Stretch marks are one of those unsightly blemishes that women dread the most. They are cosmetically unpleasing and generally develops due to the sudden changes in your skin. Weight gain, weight loss, puberty and pregnancy are some of the conditions that cause stretch marks. These marks generally appear where the most amount of fats are stored like the thighs, abdomen, buttocks and upper arms. There are a number of gels and treatments that are available.