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Histological sections of skin with melasma and normal adjacent skin samples stained with Fontana-Masson before and after irradiation with 40 mJ/cm2 visible light (VL), revealing an increase in the basal melanin density between the samples. (A), normal adjacent skin before VL irradiation; (B), normal adjacent skin after VL irradiation; (C), skin with melasma before VL irradiation; (D), skin with melasma after VL irradiation.
