Acne sometimes goes away as a teen enters adulthood but not every person grows out of acne.
Only about 35% of people will grow out of acne while for the other percentage of people they will have lifelong or chronic acne that doesn't go away as they age.
You can get rid of acne with apple cider vinegar or lemon juice.
Take a cotton ball and soak it in either apple cider vinegar or lemon juice from a lemon and apply it to the acne and let it sit for 15 minute or until it dries and then you can wash your face off.
You'll need to repeat the process of putting apple cider vinegar or lemon juice on the acne 2 to 3 times per day for it to be effective at getting rid of the acne.
Just keep applying the apple cider vinegar or lemon juice to the acne everyday until it's gone.