I've got some other health issues that are - like I am hypothyroid, and suffered infertility due to premature ovarian failure (both believed by some to be autoimmune related).
I've also read that rosacea is NOT related to eczema or sun exposure -- but I've had my fair shard of SUNBURN over the years, and I used retin A (skin thinning?) in my teens, AND one of my sons has very severe eczema.
I HAVE read that treating for eczema AND acne can cause or bring about rosacea, especially topical steroids (again, skin thinning).
Again, there seem to be many common variants to the triggers of rosacea and allergies, and other autoimmune overeactions of the body.