According to skin care experts there is no link between chocolate and breaking out. The reason is because acne is caused by the buildup of dead skin which blocks the pores or as a result of excess sebum. Read more at http://acne.about.com/od/acnefaqs/f/chocolate.htm.
I don't care what the so called professionals say, I get very deep painful cysts. It may also depend on how much I eat and what time of the month. Other sugar does too but not as bad as a couple of chocolate chip cookies. Sorry you have the same problem.