I Was Diagnosed With Contact Dermatitis About Two Months Ago.

I was diagnosed with contact dermatitis about two months ago. It started on my ride side and slowly spread across my abdomen, down through my belly button, down to my pubic area, down to my vagainal area, and now to may anal area and upper groin. It started out as an itchy, red rash. I have been on two rounds of oral steroids (Prednisone) as well as multiple creams and ointments. In the middle of this, I developed what I though was hemorrhoids, due to pain using the restroom and blood in my stool. Now I am thinking it is part of this skin rash. I am tempted to go see an allergist to get tested versus going back to the dermatologist for a third time to do a biopsy. I am at a loss as to what is causing this and why it won't go away. I have not tried new foods or beauty products or exposed myself to poison ivy (that I know of). Any thoughts or suggestions on where to go next for treatment?