Can you really get ink poisoning from writing on your hand?

OK my grandpa gets really pissed off when I write on my hand. But I can’t write crap on paper cause then I’ll never look at it. He says that I’m going to get ink poisoning , and I mean like yells at me when I have it on my hand. Is this true am I really going to get ink poisoning? Just by writing on my hand every once in a while? What are your opinions and facts. Can you please provide and links if possible. I am trying to get the facts to show him/ me if I am wrong.