Hi there ~
I understand your concerns. I believe that you are having problems with excessive production of sebum from your sebaceous glands which are present in higher quantity in the areas that you describe and especially during adolescence and young adulthood. I believe that you will do well with medications to help with the same, if you consult a doctor and he feels that there is also some folliculitis
(which is infection) and that it needs to be treated. I hope this helps.
Take care and have a lovely day!