I saw a YouTube video that said to apply this lotion to acne on a cotton pad and wait 10 minutes, and that if you repeat this for a few days, the marks will disappear. Since it was cheap, I decided to give it a try, and it really did disappear. So much so that I no longer needed the acne medications from the dermatologist. You can cut the cotton pad and use it on specific areas, so it's no problem even if multiple acne breakouts occur at the same time. It was too humid for me to wait 10 minutes, so I could only do 5, but it was extremely effective. I've tried various vitamin C lotions and serums, and I've learned that applying a proper amount is more important than whether it works.