Return of teenage skin (plus wrinkles!)

It is unlikely that suddenly, after so many years, your oestrogen is causing the condition.
Like you I have been on HRT for over 30 years and am on it for life. I know many people like us and have never heard of any of the symptoms you have described.
You need to see your GP. Do let us know how you get on. ?

I did have a telephone consultation with a nurse practitioner a while ago, who prescribed the scalp lotion, which did nothing, but no HCP has actually looked at it. Perhaps I should now be more insistent on seeing an actual GP, which I haven’t done for 2 years now. Thank you for your advice ladies.

You could ask for a telephone appointment, if we request one we always get one the same day then if they think they need to see us they book us in.

I think it's a perfectly valid reason to see your GP. You may have a scalp infection or allergy that needs treatment.