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Understanding Fluorouracil Cream Side Effects: A 2026 Clinical Guide and Visual Expectations

"Fluorouracil (5-FU) cream is a potent topical antineoplastic agent primarily indicated for the treatment of actinic keratoses—precancerous skin lesions caused by cumulative ultraviolet exposure. As of 2026, dermatology standards emphasize that the visible side effects of this medication are not merely adverse reactions but rather a desired pharmacological response indicating that the cream is effectively identifying and destroying abnormal keratinocytes. The Mechanism of Action and Inflammatory Response When 5-FU is applied to the skin, it inhibits thymidylate synthase, an enzyme critical for DNA synthesis. Because actinic keratoses cells div..."

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