This is where the saying a little goes a long way comes into play. Lemon juice has been the most beneficial method I've tried by FAR with my acne scarring, but you must use it with care. You do not need the whole or even half of the lemon for this routine! When I first started using lemon 2 years ago I made a big mistake by slapping too much of it on. This is extremely strong stuff, so we are only using a very small amount per use. Here's how I do it.
You will need:
Saran wrap (for storing the lemon)
Take your lemon and cut it in half. Now, take your Q-tip and just dip it into on of the lemons ridges. Don't be shy to get the end of the Q-tip fairly coated, this is where you can be generous with the amount of lemon you use. Now you can just dab the lemon onto all of your problem areas with ease.
The problem people make is they cover their whole face with lemon, when that's completely unnecessary. Not only are you going to be drying out your entire face, you are bleaching the whole thing too making the process of lightening your scars slower. You must also be sure that the marks you are treating are not ACTIVE. Active acne is not something you wanna put lemon on, at least from my experience. You should only be putting the lemon on the marks that are completely healed.
I find exfoliating before doing this to be helpful.
Burning is to be expected, though the burning should be reduced since you are only applying it with the Q-tip.
The duration of time you leave this treatment on is up to you, personally I go to sleep with it on and find that works very well.
I use olive oil for any dry skin after this treatment, and it works wonders. It does not break me out in the slightest.
It's also important to note that I have very sensitive skin, and this routine does not cause redness nor break me out! Irritation during the lemon is normal if you are just starting to use it, but redness in your face will not last after you wash it off. My marks are about 60% gone after 2 months of using it about three times a week. Obviously this isn't going to be an absolute miracle worker but I'm very pleased with the results and as we all know it's a long and emotional journey to having clear skin! Good luck everyone!