Excrutiating Itchiness! Help!

I've been experiencing outer vaginal itchiness, mostly on one side of my labia, for well over a year now. My Dr. Thought it was just a skin irritation down there and prescribed cortisone cream. I tried this on and off for a long time and it's never gone away. Some times the itchiness gets so bad, I think I could scratch and scratch until I bleed, and I have actually scratched myself raw at times which of course just makes it worse! I also notice the skin gets very dry and flaky. I don't have any other symptoms like abnormal discharge or weird odour so I have no idea what this is. I've been trying aveeno cream to relieve it but this is only an immediate relief and does nothing to solve the problem. Should I see a real "gyno" about this, rather than my fam. Dr? Or a dermotologist? Somebody help!! :cry: