Chisaki has a mysophobia problem, and a big one at that. Once a week he goes to see a doctor he (sort of) trusts, bringing up issue after issue that basically don't even matter, just because they bother him. Every time anyone touches his skin without some sort of barrier there, the villain feels like he could vomit from pure disgust. He hates it with every fiber of his being. So he'll do these checkups with his doctor, making sure he is as pure as he wants to be, no impurities or sickness.