If use whitening lotions would your skin go back your normal color and stay like that or do i have to keep using the whitening lotions?

If you use skin whitening lotions to lighten your complexion then stop you could return to your normal colour if you do not protect your skin from the sun.

Adequate protection from the sun should go hand-in-hand with any skin lightening treatment and a high factor sun screen (at least SPF 15) should be worn daily even after you stop the treatment.