My skin recently got white spots (wit vlekke) on the back of my hands. Mostly on the thumb and in between my fingers. Should I let it be checked out at the GP?

While skin spots. Hello, more information would help (any similar spots elsewhere? Family history of such? Completely white, or just less color than normal skin?), but I suggest you have these evaluated. Most likely causes would be a post-inflammatory process (trauma?), but vitiligo should be ruled out.