I am taking althea pill for my ovarian cyst, currently I'm on my 2nd month. But I am planning to take Doxycyline for my pimples, will it affect the effectiveness of the oral contraceptive pill?

And please don't say that althea can help reduce my pimples, I know that, but I can't wait 3 months, it's getting worst, I could not stand it. Thanks for the answers.