Rosacea (also known as adult acne) is common among people
of english and irish descent.
We react to heat, stress, exercise, alcohol.
Some people have a "butterfly" effect across the nose
and cheeks. Some have a bulbous nose, like w. C. Fields,
the guy in movies from the 30's with a top-hat and sort of
a whiney voice. No known cause, but topical meds are
available.

There are other diseases with similar symptoms.