Hope, I've had rosacea for years too. I never noticed a connection between it and PN flares, but now that you've mentioned it, I'll try to take note of it. Like you, I've been tested as negative for lupus. I have no basis for it whatsoever, but the connection makes sense to me on a gut level (I prefer to call it a "cellular" level).

But you shouldn't take too much stock in what makes sense to me: we were both just fine, rowing and cycling and enjoying life. But ever since we quit smoking, I got cancer, GI problems, a hip replacement, and PN. My partner developed PMR. So we're both whiny messes at this point. She's an amputee from the hip (from childhood) so while we expected a certain number of challenges from life, these new disabilities with both of us have presented us with a whole new set of, um, things that optimists call "new opportunities." At some times we are given to wistful memories of when we were both hale, hearty, and smoked. But we never consider starting again, so don't worry about that.

Anyway, I will try to pay attention to when I have rosacea flares and if they coincide with PN flares.