Had the same when I was younger but was put down to being an ‘outie’ and the skin getting sore because it was irritated but to the point of bleeding and blistering and what have you . Had surgery on the NHS in the end which was life changing but as I understand it ten years on chances would be slim to none of getting that sort of help without for instance, previous cancer treatment or congenital syndrome (I am suspected to have had the former) .
Still have other problems - but the worst was sorted with that op .
Over the years though I had endless input from GP, a vulval skin clinic and gynae though - I was told to wear cotton (non lacy or nylon or fake satin) pants , no thongs, just granny pants .
No talcum powder, bubble bath, femfresh, etc etc - just plain warm water . Obviously wash outside but the inside just water is enough . Even told to wash hair over bath if having a bath . Oatmeal should help or aveeno. You can probably buy Dermol soap substitute too now .
I was advised not to use sudocrem, bepanthen is better , and to use replens if very dry/irritated . Vagisil is quite irritating so would steer clear . I was suggested to use canesten but that made things worse too .
You can get 50/50 emollient but that’s pretty horrible stuff from memory and I wouldn’t use that unless desperate .
You do need to wash underwear in soap of some sort though - you get gentle washing powder I think . Water doesn’t get bacteria out so won’t be helping matters .