How to reduce the appearance of cellulite and stretch marks at 16?

No consistent way : Cellulite and stretch marks are two of the most difficult and vexing cosmetic surgery conditions to treat. Endermologie has been used to temporarily reduce the appearance of cellulite. Cellulaze may also be if some benefit but can be quite costly and take a year to see improvements of only 30%.

Hard question: Honestly, we don't have great treatments for either cellulite or stretch marks. Retin-a cream can help stretch marks a little. Certain new laser treatments can help stretch marks and cellulite (different lasers). But most of the products & creams you see offered for sale are pretty much worthless. Sorry.

Stretch Marks/Cellulite: Cellulite and marks pink stretch marks can be slightly reduced with special lasers but don't expect disappearance. For a procedure that would help to cure your cellulite, there is a laser treatment called cellulaze that was recently approved by the fda last year. This procedure is proven to show better results after just one session. As for the stretch marks, try to moisturize them in the early stages while they are still red or purple in color, as they are easier to treat then. https://pacificcenterplasticsurgery.com/procedures/body/liposuction/.