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Histological sections of skin with melasma and normal adjacent skin samples stained with Fontana-Masson before and after irradiation with 1.524 mJ/cm2 UVB, revealing an increase in the basal melanin density in the different samples. (A), normal adjacent skin before UVB irradiation; (B), normal adjacent skin after UVB irradiation; (C), skin with melasma before UVB irradiation; (D), skin with melasma after UVB irradiation.
