Hi!
It is certainly possible that you have developed a dermatitis. If so, your best bet is going to be a topical steroid cream such as cortisone or clobetasole. If you were my patient and I suspected dermatitis, I would prescribe one of these topical agents and have you return in 2-3 weeks if not better. If a topical steroid didn't help, I would want to do a biopsy to be sure there is nothing going on such as lichen sclerosis or dysplasia.
Hope this helps!
Good luck!
Dr B