I have had the same sweating, but also including my forearms, chest, and legs. It always starts on the head and face though. I have found no doctor that has any idea.

If I can get air blowing on my face and head or whole body, in a short period of a few minutes, I see change and improvement. This period of time is not long enough to have an impact normally with the volume of sweating present in all my prior "normal" life precovid experiences.

It would seem this is a reactive response to a nerve signal which then is repeated inadvertantly or the receiving body system is misinterpretting the signal. The sweating is fast. I can be totally comfortable then a few minutes later, heavy sweating. I do not have "to do" anything. But, I note that most of the time the room or where I am may "feel" slightly warm. If I walk slowly three to five minutes, even when it is cold, it also begins. Yes, I see the redness also.

Some type of normal response in the body has been vastly modified or better stated, excellerated in time response and sweat volume.

For myself, this has been occuring several years through multiple infections and multiple Long Covid episodes.

Flowing air, preferred cold, has rapid impact. Stationary, even cold air, has little impact. An over response is needed to the over response....

Justin