Stress, through increased output of hormones from the adrenal (stress) glands.
from personal experience I can tell you the best way to treat old ones is by using natural treatments. Because they don't even cause something and do not have side effects.
My wife was not willing, and said how do i get rid of old acne scars with this book, but I convinced her to try at least once. And I am glad to tell you that she cured her skin, well not in three, but yes in 5 days. She cleared even her old ugly acne scars, and that was amazing. So we decided to write this article for those who need help.
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tags: home remedies for cystic acne, organic herbs for acne, best treatment for hormonal acne in adult woman