What should I expect of my skin with weight loss?

I'm turning 27 soon and I'm 5'4 and 142lb. My ideal weight is 125lb and I am targeting to go back to that. Problem is, I'm worried about my skin. I've noticed normal aging volume loss in my face, although my cheeks are pretty chubby/lumpy in other places from being slightly overweight. But if I drop 20lb slowly and healthily, should I expect droopiness? And if so, will it tighten up with time? And will the tretinoin (topical retin-A) I use for acne help or hurt or not make a difference? Thanks

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