Maybe it is not the best thing just to sit and get into such kind of terminology whilst thousands or millions of people suffer from acne in their real everyday life but it is said that you cannot defeat the enemy without knowing what he is.
Or who he is, but in case of acne we talk about inanimate enemy, which is caused by some other, animate or inanimate foes, called external or internal causes of acne. So maybe here we will try to study acne, to know, from where it comes from. Maybe it is not the best idea and direction of study, just to elaborate the parallel between internal and external causes of acne.
But at least we will try as well as try to make this study a little bit useful. At least classification is also made for some purposes, and all animals (including humans) and plant and mushrooms and bacteria are classified into different worlds.
Another reason for conducting this small study is the difference between actual understanding of external and internal factors causing acne. As for me I have elaborated my own understanding, however, not every time it is the same with other’s classifications. Well, it may be not so important, but nevertheless it is always good to have some common truth for everyone.
So I have read an article in Internet telling about such classification. Surely this article maybe more informative than this one, but I do not agree fully with the classification offered there.
What is suggested by the author of that article, is dividing causes of acne into external and internal. That’s my approach too. But the author offers such categories of as bacteria, sebum production, follicle growth, hormones (including androgens and stress), genetics, diet and prescription drugs/steroids. As for me, I regard at least the last one to external causes (and maybe even the last two). You can disagree, but drugs are taken as makeup (100% external cause) is used.