Hi doctor, I ive had a very Sivere case of acne for the past 3 years....i had taken azithromcin(250) tab once a day for 6 months before, then the pimples dissapeared for a while, now again it has returned, ive been taking azithromycin again for the past 3 months bt the pimples are not completely going this time, the size nd friequency has been reduced bt still its occuring....what do I do?....plz suggest something...