What else can cause a red face after drinking besides asian flush syndrome?

Rosacea: Rosacea is a chronic and potentially life-disruptive disorder primarily of the facial skin, often characterized by flare-ups and remissions. Many have observed that it typically begins any time after age 30 as a redness on the cheeks, nose, chin or forehead that may come and go. In some cases, rosacea may also occur on the neck, chest, scalp or ears. Alcohol can cause a flare.