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They'd get really sunburnt and maybe end up with visual damage from accidentally glancing at something brighter than they evolved with. Ditto for how you or I would do under Sirius or Vega ("blue" stars).
What if a black person from Earth went to the poles of a planet orbiting a blue star? You know, blue star Scotland.
I couldn't actually tell you how much worse the sunburn problem would be, exactly. On top of the new blackbody spectrum you'd have to account for the influence of the atmosphere, which is actually a very complicated problem even on Earth, and then find detailed data on the sensitivity of human skin of various kinds to various frequencies and patterns of exposure.
(For an unspecified alien it's obviously impossible, although we can guess that, like all biology, it's affected negatively by energetic light without special adaptations to fight the damage)
On the rare sunny Scottish days, they better stay indoors mostly or wear a mask to protect their eyes. What we're talking about is a welding arc in the sky.