Hello Hellen,
I must confess my ignorance on this one.

I do not know what striae gravidarum is. Could you explain a little bit so I will know the best way to answer your question?
Also if any of you reading this has the same thing it would be nice if you post here to help us both out. Me for the knowledge and you for things that can be done to address the problem.

We both thank you in advance.