Can IPL Make Stretch Marks Worse?

IPL treatment might improve the appearance of your stretch marks slightly if your stretch marks are still red.  It is highly unlikely that it would make the appearance of your stretch marks worse.  There are some other modalities that might help your stretch marks, such as retinoid creams and some lasers.  Unfortunately at this time we do not have a way to markedly improve the appearance of stretch marks, although many patients are happy with moderate improvement.

We have been treating Stretch marks with lasers for the past 5 years and we have never seen any that have gotten worse because of Laser treatments. Many have not responded well, but we do not know any reason why they would get worse.
Stretch marks are extremely difficult to treat, especially if you have the thin, white or silvery type. We have treated many different stretch marks successfully and a good many without any appreciable results as well. The easiest type of marks to revise are new stretch marks that are pink (Caucasians) or brown (Hispanics, Asians and African Americans).
We have also had pretty good results revising the texture of marks - making them less rough and deep. But, thin white stretch marks with less color than the surrounding tissue are extremely difficult to treat and we do not have a good solution for them currently.
We do not use IPL to treat stretch marks. We use the following:

Pulsed dye lasers (red/textured stretch marks)
Q-switched lasers (brown/textured stretch marks)
Aramis laser(textured stretch marks)