What does it mean that my face is not black at all but white??

I advise everyone not to underestimate the ultraviolet rays in winter. Although they may not feel hot, they can really deal a fatal blow to my whitening career! So I have always insisted on sun protection over later remedies for whitening, but it is also impossible for me not to be exposed to the sun at once, so I cannot do without either of these! I can achieve the effect of 1+1>2 here!