I have faced acne vulgaris on back on chest part. It takes around more than 3.5 yrs. Whether it doesnot make itchy but having redcolor small bumps and it takes more than 2 weeks to reduce a marks. I have lot of number on my back and chest. I medicated a dermatologist and she said that it has been as usual and may remain upto 25 yrs. But i make 25+ but it doesnot gone whether its serverity reduces but doesnot clear. My questions: 1. Why this would been happen 2. How much i take medication because i take medicine more than 3.5 yrs. 3. Why new bumps has been form. 4. Any medicine do you recommended. 5. How the mark or scar has been reduce or gone.