I've had blackheads all over my face, back, chest and breasts for years but they won't stop coming back. what can i do?

Good care, patience: To paraphrase, anyone who tells you they can rid you of acne overnight is selling something. Acne is a problem of months and years. There is no quick fix. There are good treatments to be had at every drugstore starting with benzoyl peroxide creams and mild cleansers. Antibiotics like minocycline and more serious treatments like Accutane can also be very helpful but not overnight! Good luck.