Hi Snowcat, your problems sound very similar to how I was last year. I had a terrible time on and off for over a year as the GP thought I was too young for perimenopause at 40/41. She diagnosed me with dermatitis and I could not even tell you how many tubes of steroid cream I put down there

It took me around 5 weeks of ovestin (first fortnight everyday then twice weekly thereafter) to feel better. I was so relieved.
Also wanted to mention I have had very sore pimples under the skin on the vulva area. They come up and disappear after a few days. I would hit the roof if I accidentally touched the sore spot at any time. I only ever had one at a time and a GP didn't know what they were but suggested blocked pore or similar. I know it's due to low estrogen. Come to think of it I haven't had one in several months. Been on ovestin for a year roughly and Hrt (gel) for last 6 months.
I really hope your symptoms improve soon as it was all very distressing and I sympathise completely. All the best

Edit: not sure what fucidin cream is but I apply ovestin to the pimple/boil which might help or maybe it just clears up on its own after a few days? I'd be interested to hear if the same happens for you.