Suggest Remedy Rashes/pimples On Vagina

Hello, sir my wife developed this problem of allergy in and around her vagina once she was 18 years, the problem is that she feel a burning , pain and rashness around her vagina, this also gets worse even with her cloths on if she sit on grass or carpet.she consulted a doctor and got her treatment for 1 year from her.the madicines used was an anti allergy Zyrtec tablets. the doctor also told her that it will get better after her marriage. now since our marriage it has been 3 years and now she is 25 years oftenly she complains about this allergy in which its feel of burning and rashness and small redish pimples at the pubic area. she put on panty 24 hours and change it daily. once i am away from her due to my job her allergy gets more. this time i had the longest stay being away from her and she is complaining that the allergy has gone worse and she needs to see a doctor. now she is using an ointment and the zyrtec tablets. please help me and my wife out of this as it is also affecting our sexual relationship.