Hello
well, any time there is something that itches it means that something is wrong.
Especially when it is on the moist tissue.
Is there any "bad" smell? Is there a strange discharg?
I have horrible itching on the non-moist skin that goes in cycles with my horemones and no doctor can diagnose what is wrong with me.
You really need to see a doctor for this.
It could be yeast related or even worse human papaloma virus (hpv) or genital worts, or a herpies based infection.
Any itching down there that goes above and beyond the once and a while should be checked out by profeshonals.
Or, of this is a bu!!$#it question then, grow up.
But if it is for real then go see a doctor today!
Good luck