I think this is a cheap and easy thing for anyone to try. I found it was quite good at keeping my skin less oily and helped smaller pimples to heal up pretty quickly. Just mix with water 1/1.
Some people use this for red marks left from acne and have said its effective but I didnt notice any great change in them... at least no faster change than normal.
I also like drinking it. I boiled water and mixed a teaspoon of honey in with a tablespoon of the vinegar, when I used it topically as well as drinking it consistently I noticed the most change in my skin.
I highly recommend using ACV... cant hurt and its cheap!