White vinegar, as a flavoring agent for daily use, has no medicinal properties and usually does not work to relieve itching.
The main component of white vinegar is acetic acid, which is used for cooking and flavoring, and should not be used as a medication to treat clinical symptoms. Itching is the most common symptom of skin diseases, for itching symptoms, you can use local anti-itch preparations, such as glycerine lotion, Benadryl cream. Oral medications such as antihistamines like loratadine and avastin can also be used.
In addition to symptomatic treatment, the cause of the itching needs to be treated. For example, itching caused by atopic dermatitis should avoid contact with allergens; itching caused by eczema can be treated with topical glucocorticoid ointment, such as dianabed cream, compound dexamethasone acetate cream and so on.
There are individual differences in specific treatment measures, and it is recommended that the use of medication be guided by a medical professional.