Hi,this seems to be severe acne
, what we call as nodulocystic acne
, which was drained by your doctor.It is due to hormonal changes at this age.
It is common to see new acne lesions appearing during premenstrual days as in your case .
For this you need to start isotretinoin
tablets after a couple of prelimnary tests under dermatologist
prescription as there are a few side effects like dryness all over body, chapping of lips , head ache.
The larger pus filled ones need to be drained with oral antibiotic like azithromycin
A hormonal workup will be helpful , if hormones are deranged hormonal therapy may be required.
once they are under control then maintainance therapy canbe given with monthly pulses of isotertinoin and azithromycin . you can contact your doctor
hope this helps you