What Causes Oiliness And Pores On Facial Skin After Taking Plan B?

I took the Plan B bill 3 years ago and have had skin problems ever since. I have been off and on birth control once since then, and am currently using Ortho Tri Cyclin lo, for a little over a year. In a year, the pill has not helped the oiliness that I v experienced ever since taking Plan B that one time, and has caused noticeable pores on my nose and cheeks for the first time ever, as well as continued oiliness and general redness on my nose/some spotty discoloration on cheeks. Differin gel prescribed by a dermatologist has not helped the matter at all, and I do not know if I should be blaming this on Ortho Tri or Plan B from year ago. I just want my skin to be the way it used to. Will going off the pill and using non-hormonal contraception get me back to the skin I used to have, or will these noticeable pore/splotchiness be permanent side effects? If I go off my current pill, will the pores disappear, or will I likely just experience more skin problems long-term because of the hormonal change. Until age 22, I had completely clear skin, no acne, and no oiliness, maybe one blackhead every couple of months, no visible pores. For the past 3 years I am constantly monitoring my skin and it just seems to be getting worse. Now 25 and otherwise healthy, good diet as well and I use gentle cleansers, SPF moisturizer, and the occasional exfoliant scrub. I am convinced there is a correlation between Plan B and my skin, but don t know whether it makes more sense to talk to a dermatologist or a gynecologist. Seems like they are an integrated issue not addressable by one specialty doctor. Thanks!