Vulvar swelling, itching and burning after delivary?

I am 4.5 weeks PP. I normally never wear pads when I'm on my period. After giving birth I bled for about 4 weeks and wore them the whole time. I developed a rash that chafed my vulvar area and caused intense itching, burning and swelling that wont seem to heal! Has anyone else had this? What did you do to relieve/heal it? My doctor just gave me an ointment and I am hoping it works!