Intradermal Botox, Salycylic Acid Facial Wash
As you probably know by now there are many treatment options for the problems of oily skin and blackheads ranging from over the counter creams & lotions to prescription preparations to lasers.
Being that you are dark skinned some of the more agressive treatment options are risky for you (ie. chemical peels, lasers).
Two succesful options I have offered to Patients of mine with dark skin for these problems are Intradermal Botox and Salycylic Acid Facial Wash / Peels.