Can i use cortaid cream or any hydrocortisone cream on my vagina?

Not good idea in gen: There are some very specific, and relatively less common, vaginal disorders which can be treated appropriately with hydrocortisone, but for more common feminine itching such as due to yeast infection, dryness, weather conditions, etc., Hydrocortisone is really not a good idea. In addition to weakening the skin if you use it too much, it can also make you more prone to yeast infections and stds.