Dear Dr. Irwin, I switched from Yaz to the Nuvaring about a year ago. I noticed after last summer that I was getting melasma on my upper lip (I assume from the new birth conrol hormones). Will the damage be permanent if I don't switch? I have just been very careful to cover my lip with sunscreen at all times, because I love the Nuvaring otherwise. Also, why would a supposedly lower-dose birth control cause this when Nuvaring did not and I was on it for 3 years? Thanks for your help!