Sir...my Problem Was That My Body Colour And Face Clour

Sir...my problem was that my body colour and face clour wasnot maching my face clour is more dark than my body ...doctor adv me to use melaglow cream and melaguard sunscreen ..and i started from the same day .first day i found that my face is glowing but after 2 days it seems that my face getting more darker ..wht is this sir ..