Penis problem. With lot off pain.

About sexual problem My self Sairamsingh Thakur i am in busy man , so the problem is while i am sex with my wife , my Wife is suffering with allergy problem in vagina . it is happening since 2 months. I have showed my wife in hospital doctor told ntg problem is there, but stop sexual realtion for sometime and show you husband for treatment. In wife vagina became red colour of allergy . when i keep my penis in vagina my wife suffering with lot off pain. So sir how to stop this problem. It from my side or my wife problem. Pls give your answer.. And give medicine details . I was married 31 years ladie my self 23 now. After marriage pass  2 months this problem as started. I was married in November 2017, so pls give me any answer for this