Yeast infection. Pls tell me what to do?

Since the past 4 years I have been suffering from vaginal yeast infection due to which I had started to get the skin near the opening of the vagina to turn dark and itchy. I had visited my gynecologist during the 4 yrs span by there was no improvement so I visited another gynecologist. She prescribed candid B cream along with suppositors and oral medication that did solve my problem with vaginal discharge but she did tell me that the skin discoloration treatment was not her forte. So at first the skin itched aloft just near the opening of the vagina and now that part has infected around the anus as well. I do apply candid B cream every now and then but it's difficult to keep the area dry for long since I need to visit the loo often. I don't want to show my anus to a doctor as it is very embarrassing for obvious reasons. I am really fed up trying everything. I have taken flucazone and applied the candid B cream at the same time but to no avail. can someone pls tell me what to do?