From my natural hormones (Testosterone) I got stretch marks on my hips, and thighs which I thought is quite unusual for a biological man but who knows. They never bothered me much when I was in my teen years but last couple of years I got very self-conscious of them (because sexual opportunities can happen at any time) - my hips are white stretch marks and I'm a pale person generally so that didn't bother me as it's barely visible but my thighs were EXTREMELY purple after 5-7 years, which generally they turn white so I knew they were going to stay purple.
So I asked my mum and she told me about 'bio-oil' so I put that one and after a week I forgot to put it on, and don't put it on anymore but after just 2 days the stretch marks went from a deep purple to a light purple, and after a week to white, and they're still visible but for me I feel less bothered about them so I didn't need to put it on anymore it was just the colouration that bugged me. So I'd suggest Bio-Oil it's also good for acne scarring and so on. And if I want the stretch marks gone completely I will go back to it as it's not too pricey for the wonders it does.