Peanut allergy is common and on the rise in children. Peanut allergy tends to be lifelong.
Peanuts are legumes. Legumes grown underground and are not the same as tree nuts.
Peanuts are not tree nuts. The two allergies are not the same. However, some people have both allergies. Also there is a risk of cross-contamination between the two.
People with peanut allergy must avoid all things containing peanut including peanut butter and peanut oil.