Intense itching in the same spot

Itching, particularly when there is also pain that is not obviously from other external/topical skin issues is nearly always coming internally from some type of inflammation/obstruction/infection. Certainly fibroids (which can come and go), kidney issues (such as stones), ovarian cysts, etc. could all create what you are describing. It would be a reasonable idea to consult with an ob initially and have them do an ultrasound at least, or a physical inspection to try to see what you are working with (even if your plan is to treat it entirely with Chinese Medicine).

While not always this range of issues may arise from liver stagnation (which can generate heat and/or wind). So if you have been receiving treatment based on that diagnosis, either this is something entirely new that a practitioner would have to account for, or just another manifestion of your yet unresolved (or misdiagnosed) underlying issues - in which case more and (possibly) better tailored treatment would be required from the Chinese side.