Personally, coming from a family who has a strong history of breast cancer, I would not rub any kind of hormone into my breasts natural phytoestrogenic/progesterone or what ever.
The BCP's could be the cause or diet or sometimes it's just the genetic code to be prone to such kinds of growths.
With the BCP's you need to investigate the different kinds of hormones available. There are so many different kinds of hormones now and combination that it's purley a shot in the dark guessing what might be the cuase with out sufficiently looking at your medicines and the reality of their side effects.
Additionally, cutting down on saturated fats and working on losing body fat if over weight is a valid answer especially if you tend to gather weight arounf the mis section.
And, if that's the case, then structuring your diet to keep the waist area a bit smaller, even if you tend towards being thin, would still be the right answer.
That would be more lean protein and less fats or estrogenic foods like soy or yams or fruits with pits.
Not to say you can't eat that stuff but just bring down ones consumption a bit if you notice your diet high in estrogenic food consumption.
I see a Reproductive Endocrinologist and I like that kind of doctor best for an accurate assessment of the hormonal situation in the body and giving direction for what is needed with regards to specifics.
And, if you are having a real problem, then specifics will really be the only answer.