As per a recent study, rosacea occurs due to a combination of genetic and environmental factors such as a compromised immune system, having light-colored skin, too much exposure to sunlight, or someone in the family who has a history of rosacea. Typically, the initial sign of rosacea can be modest, which may include an evident skin redness. However, this may become more persistent redness with time, and spider veins may appear, giving the skin an uneven and rough look. At times, these symptoms may become so severe that the skin tissues of the nose become puffy and jagged. This type of rosacea is called rhinophyma, which typically occurs in older men.