Unfortunately, many studies have looked into potential cures for stretch marks and to date, there does not appear to be any one wonder cure. There are various anecdotal things such as shea cream, coconut oils, and a variety of other creams that some people may say improve stretch marks. Lasers have been used with some success in the literature. Sun tanning is not a very good option because that skin will likely tan at a different rate than the surrounding skin and will stand out even further.
It is recommended that you discuss these questions with a dermatologist
as they will be best able to discuss any options that in their experiences have been beneficial. Again, most studies do not show that there are any good methods to improve stretch marks completely.