Common : It sound like you are being treated for precancerous facial lesions (actinic keratosis or solar keratosis) which if left untreated can progress to squamous cell carcinoma. There are a variety of treatments for this, and you've been prescribed one of them. Usually the topical treatment lasts for 6 weeks (your Doctor will tell you how long). The involved areas of your face will get noticeably red.
Answered 1/2/2016
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