No, theories regarding the cause of rosacea include reaction to microbes, but the rash does not spread via touch. Antibiotic treatment is thought to be effective due to its anti-inflammatory properties rather than because of its antibacterial properties.
Rosacea is generally a long-term recurring condition. In some people treatment settles the symptoms quickly and for a long period, but others may need repeated treatments, or may need to try different treatments. Some people may need to treat almost continuously.
Rosacea is most likely to develop between the ages of 30 and 60. But cases have been seen in children and younger adults.
Doctors sometimes divide rosacea into four subtypes, but most people overlap the groups. They are:
Rosacea is thought to affect around 5% of the worldwide population. It is more common in less pigmented skin, but can be found across all skin types. Rosacea may be present in up to 1 in 10 Caucasians, but most of these cases will be mild. About 14% of Caucasian women have rosacea and about 5% of men. The more severe cases of rosacea, including rhinophyma, tend to be in men.
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