I did, I was plant based for 8 years. I was just vegetarian for 7 years of that, the result was absolutely zero change in my skin at all, then I went vegan and that's when I noticed real change, in that my skin got at least 10x worse.

There is absolutely no logical reason as to why plant based diets would be good for your skin, vegan diets in particular are nutritionally inferior to every other diet.