i have a pimple prone skin... they only appear few times in many months.. but when they do....they leave marks..and they start 2-5 at a time.... what causes them to appear? why all of a sudden and not all along.. what can i do to prevent scars? pimples on my forehead and chin usally dont leave scars only ones onmy cheeks do. and I consulted a doctor once.. he said i dont have acne vulgaris ... i dont have pimples on my back but usually on face and sometimes on my scalp... Please help. Regards
Please mention your age and sex.  Your pimples can be easily treated by a dermatologist. Hormonal variations and stress are the main reasons. Do not pick your pimples which can cause scarring. Once the pimples are treated u can go for acne scar treatment.