I guess I forgot to ask if you'd seen a doctor about this at all. If they've ever examined the area?
Hi. Okay, this sounds incredibly annoying! I'm sure this drives you crazy as an unrelenting itch would! Couple of possibilities:
Psoriais
"Problems that affect other parts of the body also may affect the vulva. Psoriasis, for instance, is a skin disease that can appear on the vulva as red, thick, scaly patches that may itch.
Vulvar Dystrophy
A vulvar dystrophy is abnormal skin on the vulva. The skin can be too thin (lichen sclerosus), too thick (hyperplasia), or a mixture of both."
Here is some info too: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3691475/
I'm sorry your gyn isn't being terribly helpful. I am a firm believer that squeaky wheel gets the oil so keep asking and pushing for help. A dermatologist may be able to help you as well.
THIS IS COULD BE A BARTHOLIN CYST AND IT IS SOOOO IRRITATING. I HAD SURGERY AND THEY REMOVED THE BARTHOLIN GLAND. HOPE THIS HELPS.