My sister works for a dermatologist and has very acne prone skin. He told her to do this.
When she gets home from work, she washes her face and puts a thin layer of honey all over it. She leaves it on until she takes a shower in the evening. You have to keep it very thin or you will have a big mess. Apparently it works to kill bacteria and it also has improved the areas where acne had damaged her skin. She hasn't had a break out since she started doing this.