Whenever I am on my menstrual cycle, I get whiteheads all over my face. As a result, they leave scarring (dark spots). This has never happened to me (I used to get the whiteheads on my chest, now they have migrated to my face!) I have become depressed as a result because my once-clear face has dark spots everywhere. The medicine my dermatologist gave me (clindamycin) is not doing anything to stop the whiteheads from forming on my face every month. Help!