Rosacea: A skin disorder that is characterised by patches of red skin on the nose and cheeks and acne-like bumps; most commonly occurs in middle-aged women.

Acne: A disorder of the skin marked by inflammation of oil glands and hair glands.

Tretinoin: A drug that belongs to the family of drugs called retinoids. It is used in the treatment of acne and is being studied in cancer prevention.

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