You can achieve high-quality results using only native Premiere Pro effects. Method A: Lumetri Color + HSL Secondary (Recommended) Open Lumetri Color: Go to the Effects panel and select Lumetri Color Isolate Skin Tones: HSL Secondary
Use an Opacity Mask (the pen tool under the effect) to apply the smoothing only to the face so you don't blur the background. 2. Free Presets & Templates smooth skin plugin for premiere pro free download