5. Visible Blood Vessels
As mentioned, one of the possible explanations for rosacea is that it is a general disorder of the blood vessels. Blood vessels are of course veins and arteries, as well as capillaries. You have countless tiny capillaries under the skin around your face, and these can sometimes become visible.
There are lots of reasons for this. One is that you might have thinning skin, which allows the veins to show through. Another is that you might have issues affecting the blood vessels themselves, causing them to appear redder or to rise nearer the surface of the skin. The latter is often associated with rosacea. Fortunately, there are some management techniques you can use in order to combat the issue.
Note that you are more likely to notice these small blood vessels if you have very pale skin. And in fact, you are also more likely to develop rosacea if your skin is very pale.