What To Do For Stretch Marks and Skin Care?

Hi, I’m a 16 year old girl and I have stretch marks on my inner thigh. I’m not a fat person but I did lose 10 pounds. So I want to know what I can do to fix that.

Also, what are some good skin care stuff for dry skin, mild acne, mild black heads. Just stuff that will make my skin look good.

Cocoa butter = stretch marks
tea tree oil = acne/black heads/dry skin