The vulva is the delicate, hairless skin and tissue surrounding the vagina. You need to treat it with care, as it's prone to irritation.
Avoiding soap and excessive washing is the single most important thing you can do to avoid irritation of the vulva. Some women worry irritation might be caused by lack of hygiene and wash more often, but this can make the problem worse.
It's common for women to have vulval irritation from time to time. If it happens repeatedly, see your doctor, especially if it's interfering with sex.
Organisations that specialise in this area of reproductive and/or sexual health