What Causes Rashes Around The Groin Area?

I experienced a severe attack of rashes and sores around my groin and pubic areas about a year ago. I visited the hospital where a Dermatologist after examination recommended that I buy itraconazole tablet and fungusol powder. I used this for over 3 months but the situation persisted. I continued for some time more before i saw over the internet that kerosene is a good remedy. I applied petrol on it for some time instead of kerosene because i do not have kerosene. This cleared after some time. This time around, it reoccurred with rashes in the groin and a great deal of itching. Please what I do? In both cases, my wife is pregnant.