Face darker than body. What should I do?

my face skin suddenly become so dark at age of 10 .very fair when I was child..nw I am 26 used hydroquinone retin ..but it cure was temporary when I step out sun if I use sunblock also my face become dark like night but my body is so fair .I can't compare my face to body ,so mismatch. .wht shud I do? what should I do???even if use gud sunblock if I step out sun my face become so dark like hell.but my hands willnt become dark...I don't knw wht to do

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