Rosacea is a fairly common disease, especially in fair-skinned people of Celtic or Northern European heritage, hence the term curse of the Celts. Although women are more affected than men in earlier stages (3:1 ratio), men develop the swelling tissue that lead to rhinophyma (an enlarged, bumpy nose) much more frequently.

The importance of sun-damaged skin in rosacea cannot be stressed enough. Rosacea is always associated with sun exposure, so protection of the skin with total sun blocks and cover ups is important. (To view or purchase total sunblock click here) However, an increase in sun sensitivity has not been shown in rosacea patients.

Some other contributing factors may be genetic disposition (heritage); gastrointestinal disturbances; and bacteria. The sun may also heat the skin and cause it to blush. None of them has been definitely confirmed, other than the contributing factors of sunlight and heat. It is certain, however, that rosacea patients have a tendency to flush and blush.