Historically, the main issue related to candy was the risk of choking. Anything the size and shape of a grape is a chokeable candy for a young child under age 3 or 4.
• Remove all such candies from your young child's bag and double check older sibling's bags.
• If you are supervising a child with nut allergy, an EpiPen -- auto-injector for allergic emergencies (anaphylaxis) -- should be on-hand.
• Don't allow candy consumption until the candy is checked.
• At your home, consider a nut-free candy bowl for trick-or-treaters or going nut-free altogether.