Question to those who've lost 20+ kgs in a short time

So to those of you who've lost 20+ kgs in like less than 6 months or shorter.. Do you have lose skin and stretch marks?

I'm like 5 foot nothing and currently at 68 kgs and the gym i started going to did a full body scan with some machine and suggested i lose 22 kgs of fat and gain 5kgs of muscle..

So I'm just worried about lose skin and stretch marks.. will my 6 months goal increase the risk of getting them or should i go slower? Is there any supplements or creams that i should use to prevent them?