any advice? stretch marks

Lots of small veiny purple stretchmark kinda things have recently appeared on my bum, I haven't recently gain weight on my bum though and they just appeared over night. Had anyone had the same type of thing or any idea why it happened? Please give ang advice of how to get rid of them asap πŸ™πŸΌπŸ™πŸΌπŸ™πŸΌπŸ™πŸΌ