You know what's harder than putting starter on your face? Taking it off. All the liquid had dried up after 10 minutes, forming cracks when I moved my mouth and wiggled my nose.
One washcloth later, I was looking pink and feeling squeaky clean! It didn't immediately improve any underlying skin conditions, but it didn't cause any harm, either. The next morning, my skin looked photo ready.
I wouldn't say the sourdough starter was a miracle worker, but the way it made my skin feel was on par with probiotic masks I've used in the past.