Why Do Swell Up After Drinking Why Do Fingertips Swell Up After Contact With Cold Stuff?

Why do fingertips swell up after contact with cold stuff? - why do swell up after drinking

Hand of my brother is inflated and uncomfortable after touching cold materials such as yoghurt drinks or icy cold. She disappears as a rule, of course, after a certain time. He is 16 and has no health problems. No idea why this happens or how to stop it?