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Mequinol, MeHQ or 4-methoxyphenol, is a phenol used in dermatology[1] and organic chemistry.[2] Contents 1 Uses 1.1 Dermatology 1.2 Organic chemistry 2 Preparation 3 Safety 4 See also 5 References Uses Dermatology Mequinol is a common active ingredient in topical drugs used for skin depigmentation. As a topical drug mequinol is often mixed with tretinoin, a topical retinoid. A common formulation for this drug is an ethanolic solution of 2% mequinol ... [wikipedia]