Pine nut allergy
Pine nuts (or pine kernels) are actually seeds, rather than nuts. But some people are allergic to pine nuts, particularly people who are allergic to more than one type of nut. Peanuts are sometimes used as a substitute for pine nuts in food products such as pesto, so people who are allergic to peanuts should be very careful about eating foods traditionally made with pine nuts.
If you are allergic to nuts, it's a good idea to avoid pine nuts and other seeds, to be on the safe side, unless you already know you are not allergic to them.
People who are allergic to pine nuts might also react to peanuts and nuts such as almonds.