No, weight gain is not to blame. The weight gain affects the hormones in your body, so weight gain is a factor insofar as its changing hormones, but it isn't 'stretching' the skin. The hormonal changes that occur as a function of gaining weight are the cause.
Skin isn't 'Stretching'
Physical stretching of the skin plays a very minor role, but the reality is it's not from moving or bending your skin. Have you ever seen anyone perform yoga or play professional sports? They are stretching their skin to an extreme extent, however none of them stretches their skin and break it resulting in stretch marks.
The bottom line is pregnancy, birth control pills, rapid weight gain or loss, topical steroid creams and rapid growing all cause stretch marks, but the reason is all those events have an effect on the hormones in our skin.
To treat stretch marks, see: Laser Stretch Mark Removal & How to Choose a Doctor for Stretch Marks
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