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Histological sections of skin with melasma and normal adjacent skin samples stained with Fontana-Masson before and after irradiation with 166 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.
