I’ve had this happen to me within the last year. Just a simple walk outside, even in cold temps, cause excessive sweating of my head and face primarily. It has even happened while sitting in an air conditioned room, doing a very gentle task.
I did get one provider to have a fairly long conversation about it, and she tried to find some cause. We ruled out all medication possibilities because I was treated with all of them for much longer than the sweating has been occurring.
She determined that it can just be a symptom of the vasculitis, but I’m actually on more treatment for that now than ever and most other symptoms are much improved- so I’m puzzled why the sweating would just now be an issue.
She also mentioned the possibility of it being autonomic in nature (I think with the vasculitis as the underlying problem), but I currently don’t have a neurologist so I am thinking of trying to get a referral. Of course, that will be a months long process.
I do plan to ask my PCP and rheumatologist about treating it with medication if it isn’t contraindicated to any of my current treatments.

I am so glad to see I’m not the only one with the issue. I was beginning to feel crazy.