hi welcome to HCM.pruritis vulvae is a most common complaint in females of all ages.
common causes for vaginal itching are,
-chemical irritantas like detergents,body spray,fabric softner,creams,ointments
-vaginal yeast infection
-pin worm infestation etc.
so you should go for following investigations,
-culture and microscopic examination of vaginal discharge,
-pap smear
-vulvar skin biopsy
-urine and blood investigation.
home remidies for control of infection and itching are
*Avoid colored or perfumed toilet tissue and bubble bath.
*Change out of wet clothing, especially wet bathing suits or exercise clothing, as soon as possible.
*Cleanse the area by wiping or washing from front to back (vagina to anus) after urinating or having a bowel movement.
*Keep genital area clean and dry. Use plain, unscented soap.
*Avoid panties made from synthetic materials
*Avoid scratching, which will only aggravate the problem.
your health care provider may prescribe following medicines
Antibiotics for bacterial vaginal infections,
Antifungal drugs for yeast infections
Benzodiazepines or antihistamines for nighttime relief
Ointments containing hormones
Steroid creams or lotions to reduce inflammation

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Hi and welcome to HCM.com!
A probable cause of the vaginal itching could be pin worm infestation. A course of deworming medicines will help. Another cause can be poor hygiene. Wash the area with warm water and soap regularly. This should help the itching. A small dose of antihistamine medication like cetrizine will also reduce the itching.
Wish you good health,.
Regards,