What is causing my "acne"? And how to solve and treat it?

hey hun im having trouble myself with acne and ive only got them in the last 6 months and doctors say stress can bring more out but then u do stress wen u get spots there horrible things ive just finished a course of tetrasyal they dont seemed to have wrked but have left me with severe dry skin so wen i do put make up on its shows up bad im my dermotoligist is now going to put me on roaccutane which is suppose to be very affective but you have to bve on the pill for a coulple of weeks first so i hope it does work as im awaiting surgery on my back and beacause i have spots on my back they will not do it cause thew puss can cause an ifection so i would see a dermotoligist good luck with everything x