I grew up constantly bothered by both feverblisters and coldsores until a friend who was training to become a Naturopath (early 1970s) told me to try this remedy. I have never had one blossom since starting this. As soon as I begin to feel the tingly start of a feverblister/coldsore, I apply a wet Vitamin C tablet to the spot, wetting and repeating 2 or 3 times. Then I swallow a couple of Vitamin C tablets (yes even the one I applied to the blisterspot). The blisterspot will disappear within 12–24 hours.
I never had any acne so I cannot help with that problem.