Apparently the pale, semi-translucent skin is a mutation that allowed hominids to live at high latitudes, where darker-skinned hominids would whither due to the lack of vitamins of the D group [1].
That same mutation made them vulnerable to the levels of sunlight at lower latitudes, susceptible to sunburns, etc.
That same mutation made them vulnerable to the levels of sunlight at lower latitudes, susceptible to sunburns, etc.
[1]: https://pmc.ncbi.nlm.nih.gov/articles/PMC8359960/