Thanks to the guy sitting next to me on the bus today, (prompting me to look this up), I now know how to say dandruff in Italian: forfora.
It comes from the Latin furfur, meaning a bran (Merriam-Webster: “the edible broken seed coats of cereal grain separated from the flour or meal by sifting or bolting.”) Basically, a speck, a freckle, or a small disc.
Devo comprare lo shampoo contro la forfora.’ – I have to buy dandruff shampoo.
Note: I, personally, do not have to buy the dandruff shampoo, but the person in the example does. Just wanted to clarify…