A method of treating, preventing, and/or managing rosacea in a subject includes the steps of administering intravenously to the subject a therapeutically effective amount of vitamin C. The therapeutically effective amount is at least one gram of vitamin C. The administering may be performed once every day or every other day. Alternatively, the administering may be stopped for a one week in a month period, or for one week in any eight month period. Alternatively, the administering may be performed once every day for a week and off for a week, wherein the method is then repeated or performed once every other day for a week and off for a week, wherein the method is then repeated.
