Rosacea was first described by Chaucer in his work The Canterbury Tales in the early 1380s in his description of

THE SUMMONER
A summoner was with us in that place,
Who had a fiery-red, cherubic face,
For eczema he had; his eyes were narrow
As hot he was, and lecherous, as a sparrow;
With black and scabby brows and scanty beard;
He had a face that little children feared.
There was no mercury, sulphur, or litharge,
No borax, ceruse, tartar, could discharge,
Nor ointment that could cleanse enough, or bite,
To free him of his boils and pimples white,
Nor of the bosses resting on his cheeks.
Well loved he garlic, onions, aye and leeks,
And drinking of strong wine as red as blood.

whose alcohol trigger is noted. Being of Northern European descent, I unfortunately inherited Rosacea. My triggers include the red pepper family. I have often heard it said that those with Rosacea should not eat mustard, but I find that, for me, it is not the mustard but the paprika in most prepared mustards that is the problem. You too might be able to enjoy mustard again. I mix powdered mustard with rice flour in a 1 part mustard to 12 parts rice flour proportion and moisten the mixture with a little water, some vinegar (between 1 teaspoon  and a tablespoon--depending on how sour you like your mustard), and a tablespoon or two of honey or corn syrup.